[esnext] load `iterator.next` only once at beginning of iteration

https://github.com/tc39/ecma262/pull/988 gained concensus during the
september 2017 TC39 meetings. This moves the load of the "next" method
to the very beginning of the iteration protocol, rather than during
each iteration step.

This impacts:

- yield*
- for-of loops
- spread arguments
- array spreads

In the v8 implementation, this also affects async iteration versions of
these things (the sole exception being the Async-From-Sync iterator,
which requires a few more changes to work with this, likely done in a
followup patch).

This change introduces a new AST node, ResolvedProperty, which can be used
as a callee by Call nodes to produce the same bytecode as Property calls,
without observably re-loading the property. This is used in several
AST-desugarings involving the iteration protocol.

BUG=v8:6861, v8:5699
R=rmcilroy@chromium.org, neis@chromium.org, adamk@chromium.org

Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: Ib81106a0182687fc5efea0bc32302ad06376773b
Reviewed-on: https://chromium-review.googlesource.com/687997
Commit-Queue: Caitlin Potter <caitp@igalia.com>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50452}

src/ast/ast-numbering.cc

@@ -195,6 +195,11 @@ void AstNumberingVisitor::VisitProperty(Property* node) {
   Visit(node->obj());
 }
 
+void AstNumberingVisitor::VisitResolvedProperty(ResolvedProperty* node) {
+  Visit(node->object());
+  Visit(node->property());
+}
+
 void AstNumberingVisitor::VisitAssignment(Assignment* node) {
   Visit(node->target());
   Visit(node->value());
@@ -251,6 +256,7 @@ void AstNumberingVisitor::VisitForInStatement(ForInStatement* node) {
 
 void AstNumberingVisitor::VisitForOfStatement(ForOfStatement* node) {
   Visit(node->assign_iterator());  // Not part of loop.
+  Visit(node->assign_next());
   node->set_first_suspend_id(suspend_count_);
   Visit(node->next_result());
   Visit(node->result_done());

src/ast/ast-traversal-visitor.h

@@ -392,6 +392,14 @@ void AstTraversalVisitor<Subclass>::VisitProperty(Property* expr) {
   RECURSE_EXPRESSION(Visit(expr->key()));
 }
 
+template <class Subclass>
+void AstTraversalVisitor<Subclass>::VisitResolvedProperty(
+    ResolvedProperty* expr) {
+  PROCESS_EXPRESSION(expr);
+  RECURSE_EXPRESSION(VisitVariableProxy(expr->object()));
+  RECURSE_EXPRESSION(VisitVariableProxy(expr->property()));
+}
+
 template <class Subclass>
 void AstTraversalVisitor<Subclass>::VisitCall(Call* expr) {
   PROCESS_EXPRESSION(expr);

src/ast/ast.cc

@@ -805,6 +805,10 @@ Call::CallType Call::GetCallType() const {
     }
   }
 
+  if (expression()->IsResolvedProperty()) {
+    return RESOLVED_PROPERTY_CALL;
+  }
+
   return OTHER_CALL;
 }
 

src/ast/ast.h

@@ -94,6 +94,7 @@ namespace internal {
   V(Literal)                    \
   V(NativeFunctionLiteral)      \
   V(Property)                   \
+  V(ResolvedProperty)           \
   V(RewritableExpression)       \
   V(Spread)                     \
   V(SuperCallReference)         \
@@ -590,11 +591,13 @@ class ForInStatement final : public ForEachStatement {
 class ForOfStatement final : public ForEachStatement {
  public:
   void Initialize(Statement* body, Variable* iterator,
-                  Expression* assign_iterator, Expression* next_result,
-                  Expression* result_done, Expression* assign_each) {
+                  Expression* assign_iterator, Expression* assign_next,
+                  Expression* next_result, Expression* result_done,
+                  Expression* assign_each) {
     ForEachStatement::Initialize(body);
     iterator_ = iterator;
     assign_iterator_ = assign_iterator;
+    assign_next_ = assign_next;
     next_result_ = next_result;
     result_done_ = result_done;
     assign_each_ = assign_each;
@@ -609,6 +612,9 @@ class ForOfStatement final : public ForEachStatement {
     return assign_iterator_;
   }
 
+  // iteratorRecord.next = iterator.next
+  Expression* assign_next() const { return assign_next_; }
+
   // result = iterator.next()  // with type check
   Expression* next_result() const {
     return next_result_;
@@ -624,6 +630,12 @@ class ForOfStatement final : public ForEachStatement {
     return assign_each_;
   }
 
+  void set_assign_iterator(Expression* e) { assign_iterator_ = e; }
+  void set_assign_next(Expression* e) { assign_next_ = e; }
+  void set_next_result(Expression* e) { next_result_ = e; }
+  void set_result_done(Expression* e) { result_done_ = e; }
+  void set_assign_each(Expression* e) { assign_each_ = e; }
+
  private:
   friend class AstNodeFactory;
 
@@ -637,6 +649,7 @@ class ForOfStatement final : public ForEachStatement {
 
   Variable* iterator_;
   Expression* assign_iterator_;
+  Expression* assign_next_;
   Expression* next_result_;
   Expression* result_done_;
   Expression* assign_each_;
@@ -1607,6 +1620,25 @@ class Property final : public Expression {
   Expression* key_;
 };
 
+// ResolvedProperty pairs a receiver field with a value field. It allows Call
+// to support arbitrary receivers while still taking advantage of TypeFeedback.
+class ResolvedProperty final : public Expression {
+ public:
+  VariableProxy* object() const { return object_; }
+  VariableProxy* property() const { return property_; }
+
+  void set_object(VariableProxy* e) { object_ = e; }
+  void set_property(VariableProxy* e) { property_ = e; }
+
+ private:
+  friend class AstNodeFactory;
+
+  ResolvedProperty(VariableProxy* obj, VariableProxy* property, int pos)
+      : Expression(pos, kResolvedProperty), object_(obj), property_(property) {}
+
+  VariableProxy* object_;
+  VariableProxy* property_;
+};
 
 class Call final : public Expression {
  public:
@@ -1633,6 +1665,7 @@ class Call final : public Expression {
     NAMED_SUPER_PROPERTY_CALL,
     KEYED_SUPER_PROPERTY_CALL,
     SUPER_CALL,
+    RESOLVED_PROPERTY_CALL,
     OTHER_CALL
   };
 
@@ -2104,7 +2137,6 @@ class YieldStar final : public Suspend {
   //   - One for awaiting the iterator result yielded by the delegated iterator
   //     (await_delegated_iterator_output_suspend_id)
   int await_iterator_close_suspend_id() const {
-    DCHECK_NE(-1, await_iterator_close_suspend_id_);
     return await_iterator_close_suspend_id_;
   }
   void set_await_iterator_close_suspend_id(int id) {
@@ -2112,7 +2144,6 @@ class YieldStar final : public Suspend {
   }
 
   int await_delegated_iterator_output_suspend_id() const {
-    DCHECK_NE(-1, await_delegated_iterator_output_suspend_id_);
     return await_delegated_iterator_output_suspend_id_;
   }
   void set_await_delegated_iterator_output_suspend_id(int id) {
@@ -2997,6 +3028,12 @@ class AstNodeFactory final BASE_EMBEDDED {
     return new (zone_) Property(obj, key, pos);
   }
 
+  ResolvedProperty* NewResolvedProperty(VariableProxy* obj,
+                                        VariableProxy* property,
+                                        int pos = kNoSourcePosition) {
+    return new (zone_) ResolvedProperty(obj, property, pos);
+  }
+
   Call* NewCall(Expression* expression, ZoneList<Expression*>* arguments,
                 int pos, Call::PossiblyEval possibly_eval = Call::NOT_EVAL) {
     return new (zone_) Call(expression, arguments, pos, possibly_eval);

src/ast/prettyprinter.cc

@@ -326,6 +326,7 @@ void CallPrinter::VisitProperty(Property* node) {
   }
 }
 
+void CallPrinter::VisitResolvedProperty(ResolvedProperty* node) {}
 
 void CallPrinter::VisitCall(Call* node) {
   bool was_found = false;
@@ -1249,6 +1250,14 @@ void AstPrinter::VisitProperty(Property* node) {
   }
 }
 
+void AstPrinter::VisitResolvedProperty(ResolvedProperty* node) {
+  EmbeddedVector<char, 128> buf;
+  SNPrintF(buf, "RESOLVED-PROPERTY");
+  IndentedScope indent(this, buf.start(), node->position());
+
+  PrintIndentedVisit("RECEIVER", node->object());
+  PrintIndentedVisit("PROPERTY", node->property());
+}
 
 void AstPrinter::VisitCall(Call* node) {
   EmbeddedVector<char, 128> buf;

src/builtins/builtins-collections-gen.cc

@@ -232,10 +232,9 @@ void BaseCollectionsAssembler::AddConstructorEntriesFromIterable(
 
   TNode<Object> add_func = GetAddFunction(variant, context, collection);
   IteratorBuiltinsAssembler iterator_assembler(this->state());
-  TNode<Object> iterator =
-      CAST(iterator_assembler.GetIterator(context, iterable));
+  IteratorRecord iterator = iterator_assembler.GetIterator(context, iterable);
 
-  CSA_ASSERT(this, Word32BinaryNot(IsUndefined(iterator)));
+  CSA_ASSERT(this, Word32BinaryNot(IsUndefined(iterator.object)));
 
   TNode<Object> fast_iterator_result_map =
       LoadContextElement(native_context, Context::ITERATOR_RESULT_MAP_INDEX);

src/builtins/builtins-iterator-gen.cc

@@ -11,7 +11,8 @@ namespace internal {
 
 using compiler::Node;
 
-Node* IteratorBuiltinsAssembler::GetIterator(Node* context, Node* object,
+IteratorRecord IteratorBuiltinsAssembler::GetIterator(Node* context,
+                                                      Node* object,
                                                       Label* if_exception,
                                                       Variable* exception) {
   Node* method = GetProperty(context, object, factory()->iterator_symbol());
@@ -21,9 +22,9 @@ Node* IteratorBuiltinsAssembler::GetIterator(Node* context, Node* object,
   Node* iterator = CallJS(callable, context, method, object);
   GotoIfException(iterator, if_exception, exception);
 
-  Label done(this), if_notobject(this, Label::kDeferred);
+  Label get_next(this), if_notobject(this, Label::kDeferred);
   GotoIf(TaggedIsSmi(iterator), &if_notobject);
-  Branch(IsJSReceiver(iterator), &done, &if_notobject);
+  Branch(IsJSReceiver(iterator), &get_next, &if_notobject);
 
   BIND(&if_notobject);
   {
@@ -34,24 +35,21 @@ Node* IteratorBuiltinsAssembler::GetIterator(Node* context, Node* object,
     Unreachable();
   }
 
-  BIND(&done);
-  return iterator;
+  BIND(&get_next);
+  Node* const next = GetProperty(context, iterator, factory()->next_string());
+  GotoIfException(next, if_exception, exception);
+
+  return IteratorRecord{TNode<JSReceiver>::UncheckedCast(iterator),
+                        TNode<Object>::UncheckedCast(next)};
 }
 
-Node* IteratorBuiltinsAssembler::IteratorStep(Node* context, Node* iterator,
-                                              Label* if_done,
-                                              Node* fast_iterator_result_map,
-                                              Label* if_exception,
-                                              Variable* exception) {
+Node* IteratorBuiltinsAssembler::IteratorStep(
+    Node* context, const IteratorRecord& iterator, Label* if_done,
+    Node* fast_iterator_result_map, Label* if_exception, Variable* exception) {
   DCHECK_NOT_NULL(if_done);
-
-  // IteratorNext
-  Node* next_method = GetProperty(context, iterator, factory()->next_string());
-  GotoIfException(next_method, if_exception, exception);
-
   // 1. a. Let result be ? Invoke(iterator, "next", « »).
   Callable callable = CodeFactory::Call(isolate());
-  Node* result = CallJS(callable, context, next_method, iterator);
+  Node* result = CallJS(callable, context, iterator.next, iterator.object);
   GotoIfException(result, if_exception, exception);
 
   // 3. If Type(result) is not Object, throw a TypeError exception.
@@ -129,9 +127,8 @@ Node* IteratorBuiltinsAssembler::IteratorValue(Node* context, Node* result,
   return var_value.value();
 }
 
-void IteratorBuiltinsAssembler::IteratorCloseOnException(Node* context,
-                                                         Node* iterator,
-                                                         Label* if_exception,
+void IteratorBuiltinsAssembler::IteratorCloseOnException(
+    Node* context, const IteratorRecord& iterator, Label* if_exception,
     Variable* exception) {
   // Perform ES #sec-iteratorclose when an exception occurs. This simpler
   // algorithm does not include redundant steps which are never reachable from
@@ -139,10 +136,11 @@ void IteratorBuiltinsAssembler::IteratorCloseOnException(Node* context,
   DCHECK_NOT_NULL(if_exception);
   DCHECK_NOT_NULL(exception);
   CSA_ASSERT(this, IsNotTheHole(exception->value()));
-  CSA_ASSERT(this, IsJSReceiver(iterator));
+  CSA_ASSERT(this, IsJSReceiver(iterator.object));
 
   // Let return be ? GetMethod(iterator, "return").
-  Node* method = GetProperty(context, iterator, factory()->return_string());
+  Node* method =
+      GetProperty(context, iterator.object, factory()->return_string());
   GotoIfException(method, if_exception, exception);
 
   // If return is undefined, return Completion(completion).
@@ -152,7 +150,7 @@ void IteratorBuiltinsAssembler::IteratorCloseOnException(Node* context,
     // Let innerResult be Call(return, iterator, « »).
     // If an exception occurs, the original exception remains bound
     Node* inner_result =
-        CallJS(CodeFactory::Call(isolate()), context, method, iterator);
+        CallJS(CodeFactory::Call(isolate()), context, method, iterator.object);
     GotoIfException(inner_result, if_exception, nullptr);
 
     // (If completion.[[Type]] is throw) return Completion(completion).
@@ -160,9 +158,8 @@ void IteratorBuiltinsAssembler::IteratorCloseOnException(Node* context,
   }
 }
 
-void IteratorBuiltinsAssembler::IteratorCloseOnException(Node* context,
-                                                         Node* iterator,
-                                                         Variable* exception) {
+void IteratorBuiltinsAssembler::IteratorCloseOnException(
+    Node* context, const IteratorRecord& iterator, Variable* exception) {
   Label rethrow(this, Label::kDeferred);
   IteratorCloseOnException(context, iterator, &rethrow, exception);
 

src/builtins/builtins-iterator-gen.h

@@ -19,7 +19,8 @@ class IteratorBuiltinsAssembler : public CodeStubAssembler {
 
   // https://tc39.github.io/ecma262/#sec-getiterator --- never used for
   // @@asyncIterator.
-  Node* GetIterator(Node* context, Node* object, Label* if_exception = nullptr,
+  IteratorRecord GetIterator(Node* context, Node* object,
+                             Label* if_exception = nullptr,
                              Variable* exception = nullptr);
 
   // https://tc39.github.io/ecma262/#sec-iteratorstep
@@ -27,8 +28,8 @@ class IteratorBuiltinsAssembler : public CodeStubAssembler {
   // iterator result.
   // `fast_iterator_result_map` refers to the map for the JSIteratorResult
   // object, loaded from the native context.
-  Node* IteratorStep(Node* context, Node* iterator, Label* if_done,
-                     Node* fast_iterator_result_map = nullptr,
+  Node* IteratorStep(Node* context, const IteratorRecord& iterator,
+                     Label* if_done, Node* fast_iterator_result_map = nullptr,
                      Label* if_exception = nullptr,
                      Variable* exception = nullptr);
 
@@ -42,9 +43,9 @@ class IteratorBuiltinsAssembler : public CodeStubAssembler {
                       Variable* exception = nullptr);
 
   // https://tc39.github.io/ecma262/#sec-iteratorclose
-  void IteratorCloseOnException(Node* context, Node* iterator,
+  void IteratorCloseOnException(Node* context, const IteratorRecord& iterator,
                                 Label* if_exception, Variable* exception);
-  void IteratorCloseOnException(Node* context, Node* iterator,
+  void IteratorCloseOnException(Node* context, const IteratorRecord& iterator,
                                 Variable* exception);
 };
 

src/builtins/builtins-promise-gen.cc

@@ -1807,8 +1807,9 @@ TF_BUILTIN(PerformNativePromiseThen, PromiseBuiltinsAssembler) {
 }
 
 Node* PromiseBuiltinsAssembler::PerformPromiseAll(
-    Node* context, Node* constructor, Node* capability, Node* iterator,
-    Label* if_exception, Variable* var_exception) {
+    Node* context, Node* constructor, Node* capability,
+    const IteratorRecord& iterator, Label* if_exception,
+    Variable* var_exception) {
   IteratorBuiltinsAssembler iter_assembler(state());
   Label close_iterator(this);
 
@@ -2014,7 +2015,7 @@ TF_BUILTIN(PromiseAll, PromiseBuiltinsAssembler) {
   // Let iterator be GetIterator(iterable).
   // IfAbruptRejectPromise(iterator, promiseCapability).
   Node* const iterable = Parameter(Descriptor::kIterable);
-  Node* const iterator = iter_assembler.GetIterator(
+  IteratorRecord iterator = iter_assembler.GetIterator(
       context, iterable, &reject_promise, &var_exception);
 
   // Let result be PerformPromiseAll(iteratorRecord, C, promiseCapability).
@@ -2151,7 +2152,7 @@ TF_BUILTIN(PromiseRace, PromiseBuiltinsAssembler) {
   // Let iterator be GetIterator(iterable).
   // IfAbruptRejectPromise(iterator, promiseCapability).
   Node* const iterable = Parameter(Descriptor::kIterable);
-  Node* const iterator = iter_assembler.GetIterator(
+  IteratorRecord iterator = iter_assembler.GetIterator(
       context, iterable, &reject_promise, &var_exception);
 
   // Let result be PerformPromiseRace(iteratorRecord, C, promiseCapability).

src/builtins/builtins-promise-gen.h

@@ -157,7 +157,7 @@ class PromiseBuiltinsAssembler : public CodeStubAssembler {
   Node* CreateThrowerFunction(Node* reason, Node* native_context);
 
   Node* PerformPromiseAll(Node* context, Node* constructor, Node* capability,
-                          Node* iterator, Label* if_exception,
+                          const IteratorRecord& record, Label* if_exception,
                           Variable* var_exception);
 
   Node* IncrementSmiCell(Node* cell, Label* if_overflow = nullptr);

src/code-stub-assembler.h

@@ -71,6 +71,17 @@ enum class PrimitiveType { kBoolean, kNumber, kString, kSymbol };
     promise_default_resolve_handler_symbol,                                   \
     PromiseDefaultResolveHandlerSymbol)
 
+// Returned from IteratorBuiltinsAssembler::GetIterator(). Struct is declared
+// here to simplify use in other generated builtins.
+struct IteratorRecord {
+ public:
+  // iteratorRecord.[[Iterator]]
+  compiler::TNode<JSReceiver> object;
+
+  // iteratorRecord.[[NextMethod]]
+  compiler::TNode<Object> next;
+};
+
 // Provides JavaScript-specific "macro-assembler" functionality on top of the
 // CodeAssembler. By factoring the JavaScript-isms out of the CodeAssembler,
 // it's possible to add JavaScript-specific useful CodeAssembler "macros"

src/interpreter/bytecode-generator.cc

@@ -837,14 +837,6 @@ class BytecodeGenerator::FeedbackSlotCache : public ZoneObject {
 
 class BytecodeGenerator::IteratorRecord final {
  public:
-  // TODO(caitp): This constructor is used for legacy code which doesn't load
-  // the `next` method immediately during GetIterator. It should be removed once
-  // the followup CL lands.
-  IteratorRecord(Register object_register,
-                 IteratorType type = IteratorType::kNormal)
-      : type_(type), object_(object_register) {
-    DCHECK(object_.is_valid());
-  }
   IteratorRecord(Register object_register, Register next_register,
                  IteratorType type = IteratorType::kNormal)
       : type_(type), object_(object_register), next_(next_register) {
@@ -1700,6 +1692,7 @@ void BytecodeGenerator::VisitForOfStatement(ForOfStatement* stmt) {
 
   builder()->SetExpressionAsStatementPosition(stmt->assign_iterator());
   VisitForEffect(stmt->assign_iterator());
+  VisitForEffect(stmt->assign_next());
 
   VisitIterationHeader(stmt, &loop_builder);
   builder()->SetExpressionAsStatementPosition(stmt->next_result());
@@ -2990,7 +2983,9 @@ void BytecodeGenerator::VisitYield(Yield* expr) {
 //
 //     let output; // uninitialized
 //
-//     let iterator = GetIterator(iterable);
+//     let iteratorRecord = GetIterator(iterable);
+//     let iterator = iteratorRecord.[[Iterator]];
+//     let next = iteratorRecord.[[NextMethod]];
 //     let input = undefined;
 //     let resumeMode = kNext;
 //
@@ -2999,25 +2994,25 @@ void BytecodeGenerator::VisitYield(Yield* expr) {
 //       // Forward input according to resumeMode and obtain output.
 //       switch (resumeMode) {
 //         case kNext:
-//           output = iterator.next(input);
+//           output = next.[[Call]](iterator, « »);;
 //           break;
 //         case kReturn:
 //           let iteratorReturn = iterator.return;
 //           if (IS_NULL_OR_UNDEFINED(iteratorReturn)) return input;
-//           output = %_Call(iteratorReturn, iterator, input);
+//           output = iteratorReturn.[[Call]](iterator, «input»);
 //           break;
 //         case kThrow:
 //           let iteratorThrow = iterator.throw;
 //           if (IS_NULL_OR_UNDEFINED(iteratorThrow)) {
 //             let iteratorReturn = iterator.return;
 //             if (!IS_NULL_OR_UNDEFINED(iteratorReturn)) {
-//               output = %_Call(iteratorReturn, iterator);
+//               output = iteratorReturn.[[Call]](iterator, « »);
 //               if (IS_ASYNC_GENERATOR) output = await output;
 //               if (!IS_RECEIVER(output)) %ThrowIterResultNotAnObject(output);
 //             }
 //             throw MakeTypeError(kThrowMethodMissing);
 //           }
-//           output = %_Call(iteratorThrow, iterator, input);
+//           output = iteratorThrow.[[Call]](iterator, «input»);
 //           break;
 //       }
 //
@@ -3050,12 +3045,11 @@ void BytecodeGenerator::VisitYieldStar(YieldStar* expr) {
 
   {
     RegisterAllocationScope register_scope(this);
-
     RegisterList iterator_and_input = register_allocator()->NewRegisterList(2);
-
-    IteratorRecord iterator(iterator_and_input[0], iterator_type);
-    BuildGetIterator(expr->expression(), iterator_type);
-    builder()->StoreAccumulatorInRegister(iterator.object());
+    IteratorRecord iterator = BuildGetIteratorRecord(
+        expr->expression(),
+        register_allocator()->NewRegister() /* next method */,
+        iterator_and_input[0], iterator_type);
 
     Register input = iterator_and_input[1];
     builder()->LoadUndefined().StoreAccumulatorInRegister(input);
@@ -3087,43 +3081,23 @@ void BytecodeGenerator::VisitYieldStar(YieldStar* expr) {
         // {JSGeneratorObject::kNext} in this case.
         STATIC_ASSERT(JSGeneratorObject::kNext == 0);
         {
-          RegisterAllocationScope register_scope(this);
-          // output = iterator.next(input);
-          Register iterator_next = register_allocator()->NewRegister();
-          FeedbackSlot load_slot = feedback_spec()->AddLoadICSlot();
-          FeedbackSlot call_slot = feedback_spec()->AddCallICSlot();
-          builder()
-              ->LoadNamedProperty(iterator.object(),
-                                  ast_string_constants()->next_string(),
-                                  feedback_index(load_slot))
-              .StoreAccumulatorInRegister(iterator_next)
-              .CallProperty(iterator_next, iterator_and_input,
-                            feedback_index(call_slot))
-              .Jump(after_switch.New());
+          FeedbackSlot slot = feedback_spec()->AddCallICSlot();
+          builder()->CallProperty(iterator.next(), iterator_and_input,
+                                  feedback_index(slot));
+          builder()->Jump(after_switch.New());
         }
 
         STATIC_ASSERT(JSGeneratorObject::kReturn == 1);
         builder()->Bind(switch_jump_table, JSGeneratorObject::kReturn);
         {
-          RegisterAllocationScope register_scope(this);
-          BytecodeLabels return_input(zone());
-          // Trigger return from within the inner iterator.
-          Register iterator_return = register_allocator()->NewRegister();
-          FeedbackSlot load_slot = feedback_spec()->AddLoadICSlot();
-          FeedbackSlot call_slot = feedback_spec()->AddCallICSlot();
-          builder()
-              ->LoadNamedProperty(iterator.object(),
-                                  ast_string_constants()->return_string(),
-                                  feedback_index(load_slot))
-              .JumpIfUndefined(return_input.New())
-              .JumpIfNull(return_input.New())
-              .StoreAccumulatorInRegister(iterator_return)
-              .CallProperty(iterator_return, iterator_and_input,
-                            feedback_index(call_slot))
-              .Jump(after_switch.New());
-
-          return_input.Bind(builder());
-          {
+          const AstRawString* return_string =
+              ast_string_constants()->return_string();
+          BytecodeLabels no_return_method(zone());
+
+          BuildCallIteratorMethod(iterator.object(), return_string,
+                                  iterator_and_input, after_switch.New(),
+                                  &no_return_method);
+          no_return_method.Bind(builder());
           builder()->LoadAccumulatorWithRegister(input);
           if (iterator_type == IteratorType::kAsync) {
             execution_control()->AsyncReturnAccumulator();
@@ -3131,66 +3105,23 @@ void BytecodeGenerator::VisitYieldStar(YieldStar* expr) {
             execution_control()->ReturnAccumulator();
           }
         }
-        }
 
         STATIC_ASSERT(JSGeneratorObject::kThrow == 2);
         builder()->Bind(switch_jump_table, JSGeneratorObject::kThrow);
         {
-          BytecodeLabels iterator_throw_is_undefined(zone());
-          {
-            RegisterAllocationScope register_scope(this);
-            // If the inner iterator has a throw method, use it to trigger an
-            // exception inside.
-            Register iterator_throw = register_allocator()->NewRegister();
-            FeedbackSlot load_slot = feedback_spec()->AddLoadICSlot();
-            FeedbackSlot call_slot = feedback_spec()->AddCallICSlot();
-            builder()
-                ->LoadNamedProperty(iterator.object(),
-                                    ast_string_constants()->throw_string(),
-                                    feedback_index(load_slot))
-                .JumpIfUndefined(iterator_throw_is_undefined.New())
-                .JumpIfNull(iterator_throw_is_undefined.New())
-                .StoreAccumulatorInRegister(iterator_throw);
-            builder()
-                ->CallProperty(iterator_throw, iterator_and_input,
-                               feedback_index(call_slot))
-                .Jump(after_switch.New());
-          }
-
-          iterator_throw_is_undefined.Bind(builder());
-          {
-            RegisterAllocationScope register_scope(this);
-            BytecodeLabels throw_throw_method_missing(zone());
-            Register iterator_return = register_allocator()->NewRegister();
-            // If iterator.throw does not exist, try to use iterator.return to
-            // inform the iterator that it should stop.
-            FeedbackSlot load_slot = feedback_spec()->AddLoadICSlot();
-            FeedbackSlot call_slot = feedback_spec()->AddCallICSlot();
-            builder()
-                ->LoadNamedProperty(iterator.object(),
-                                    ast_string_constants()->return_string(),
-                                    feedback_index(load_slot))
-                .StoreAccumulatorInRegister(iterator_return);
-            builder()
-                ->JumpIfUndefined(throw_throw_method_missing.New())
-                .JumpIfNull(throw_throw_method_missing.New())
-                .CallProperty(iterator_return, RegisterList(iterator.object()),
-                              feedback_index(call_slot));
-
-            if (iterator_type == IteratorType::kAsync) {
-              // For async generators, await the result of the .return() call.
-              BuildAwait(expr->await_iterator_close_suspend_id());
-              builder()->StoreAccumulatorInRegister(output);
-            }
-
-            builder()
-                ->JumpIfJSReceiver(throw_throw_method_missing.New())
-                .CallRuntime(Runtime::kThrowIteratorResultNotAnObject, output);
-
-            throw_throw_method_missing.Bind(builder());
+          const AstRawString* throw_string =
+              ast_string_constants()->throw_string();
+          BytecodeLabels no_throw_method(zone());
+          BuildCallIteratorMethod(iterator.object(), throw_string,
+                                  iterator_and_input, after_switch.New(),
+                                  &no_throw_method);
+
+          // If there is no "throw" method, perform IteratorClose, and finally
+          // throw a TypeError.
+          no_throw_method.Bind(builder());
+          BuildIteratorClose(iterator, expr->await_iterator_close_suspend_id());
           builder()->CallRuntime(Runtime::kThrowThrowMethodMissing);
         }
-        }
 
         after_switch.Bind(builder());
       }
@@ -3442,6 +3373,11 @@ void BytecodeGenerator::VisitProperty(Property* expr) {
   }
 }
 
+void BytecodeGenerator::VisitResolvedProperty(ResolvedProperty* expr) {
+  // Handled by VisitCall().
+  UNREACHABLE();
+}
+
 void BytecodeGenerator::VisitArguments(ZoneList<Expression*>* args,
                                        RegisterList* arg_regs) {
   // Visit arguments.
@@ -3484,6 +3420,13 @@ void BytecodeGenerator::VisitCall(Call* expr) {
       VisitPropertyLoadForRegister(args.last_register(), property, callee);
       break;
     }
+    case Call::RESOLVED_PROPERTY_CALL: {
+      ResolvedProperty* resolved = callee_expr->AsResolvedProperty();
+      VisitAndPushIntoRegisterList(resolved->object(), &args);
+      VisitForAccumulatorValue(resolved->property());
+      builder()->StoreAccumulatorInRegister(callee);
+      break;
+    }
     case Call::GLOBAL_CALL: {
       // Receiver is undefined for global calls.
       if (!is_spread_call) {
@@ -3592,7 +3535,8 @@ void BytecodeGenerator::VisitCall(Call* expr) {
     DCHECK(!implicit_undefined_receiver);
     builder()->CallWithSpread(callee, args, feedback_slot_index);
   } else if (call_type == Call::NAMED_PROPERTY_CALL ||
-             call_type == Call::KEYED_PROPERTY_CALL) {
+             call_type == Call::KEYED_PROPERTY_CALL ||
+             call_type == Call::RESOLVED_PROPERTY_CALL) {
     DCHECK(!implicit_undefined_receiver);
     builder()->CallProperty(callee, args, feedback_slot_index);
   } else if (implicit_undefined_receiver) {
@@ -4164,11 +4108,10 @@ void BytecodeGenerator::BuildGetIterator(Expression* iterable,
 // Returns an IteratorRecord which is valid for the lifetime of the current
 // register_allocation_scope.
 BytecodeGenerator::IteratorRecord BytecodeGenerator::BuildGetIteratorRecord(
-    Expression* iterable, IteratorType hint) {
+    Expression* iterable, Register next, Register object, IteratorType hint) {
+  DCHECK(next.is_valid() && object.is_valid());
   BuildGetIterator(iterable, hint);
 
-  Register object = register_allocator()->NewRegister();
-  Register next = register_allocator()->NewRegister();
   builder()
       ->StoreAccumulatorInRegister(object)
       .LoadNamedProperty(object, ast_string_constants()->next_string(),
@@ -4177,6 +4120,13 @@ BytecodeGenerator::IteratorRecord BytecodeGenerator::BuildGetIteratorRecord(
   return IteratorRecord(object, next, hint);
 }
 
+BytecodeGenerator::IteratorRecord BytecodeGenerator::BuildGetIteratorRecord(
+    Expression* iterable, IteratorType hint) {
+  Register next = register_allocator()->NewRegister();
+  Register object = register_allocator()->NewRegister();
+  return BuildGetIteratorRecord(iterable, next, object, hint);
+}
+
 void BytecodeGenerator::BuildIteratorNext(const IteratorRecord& iterator,
                                           Register next_result) {
   DCHECK(next_result.is_valid());
@@ -4193,6 +4143,53 @@ void BytecodeGenerator::BuildIteratorNext(const IteratorRecord& iterator,
       .Bind(&is_object);
 }
 
+void BytecodeGenerator::BuildCallIteratorMethod(Register iterator,
+                                                const AstRawString* method_name,
+                                                RegisterList receiver_and_args,
+                                                BytecodeLabel* if_called,
+                                                BytecodeLabels* if_notcalled) {
+  RegisterAllocationScope register_scope(this);
+
+  Register method = register_allocator()->NewRegister();
+  builder()
+      ->LoadNamedProperty(iterator, method_name,
+                          feedback_index(feedback_spec()->AddLoadICSlot()))
+      .JumpIfUndefined(if_notcalled->New())
+      .JumpIfNull(if_notcalled->New())
+      .StoreAccumulatorInRegister(method)
+      .CallProperty(method, receiver_and_args,
+                    feedback_index(feedback_spec()->AddCallICSlot()))
+      .Jump(if_called);
+}
+
+void BytecodeGenerator::BuildIteratorClose(const IteratorRecord& iterator,
+                                           int suspend_id) {
+  RegisterAllocationScope register_scope(this);
+  BytecodeLabels done(zone());
+  BytecodeLabel if_called;
+  RegisterList args = RegisterList(iterator.object());
+  BuildCallIteratorMethod(iterator.object(),
+                          ast_string_constants()->return_string(), args,
+                          &if_called, &done);
+  builder()->Bind(&if_called);
+
+  if (iterator.type() == IteratorType::kAsync) {
+    DCHECK_GE(suspend_id, 0);
+    BuildAwait(suspend_id);
+  }
+
+  builder()->JumpIfJSReceiver(done.New());
+  {
+    RegisterAllocationScope register_scope(this);
+    Register return_result = register_allocator()->NewRegister();
+    builder()
+        ->StoreAccumulatorInRegister(return_result)
+        .CallRuntime(Runtime::kThrowIteratorResultNotAnObject, return_result);
+  }
+
+  done.Bind(builder());
+}
+
 void BytecodeGenerator::VisitGetIterator(GetIterator* expr) {
   builder()->SetExpressionPosition(expr);
   BuildGetIterator(expr->iterable(), expr->hint());

src/interpreter/bytecode-generator.h

@@ -151,9 +151,24 @@ class BytecodeGenerator final : public AstVisitor<BytecodeGenerator> {
   void BuildAwait(int suspend_id);
 
   void BuildGetIterator(Expression* iterable, IteratorType hint);
+
+  // Create an IteratorRecord with pre-allocated registers holding the next
+  // method and iterator object.
+  IteratorRecord BuildGetIteratorRecord(Expression* iterable,
+                                        Register iterator_next,
+                                        Register iterator_object,
+                                        IteratorType hint);
+
+  // Create an IteratorRecord allocating new registers to hold the next method
+  // and iterator object.
   IteratorRecord BuildGetIteratorRecord(Expression* iterable,
                                         IteratorType hint);
   void BuildIteratorNext(const IteratorRecord& iterator, Register next_result);
+  void BuildIteratorClose(const IteratorRecord& iterator, int suspend_id = -1);
+  void BuildCallIteratorMethod(Register iterator, const AstRawString* method,
+                               RegisterList receiver_and_args,
+                               BytecodeLabel* if_called,
+                               BytecodeLabels* if_notcalled);
 
   void BuildArrayLiteralSpread(Spread* spread, Register array);
 

src/parsing/parser.cc

@@ -1889,13 +1889,11 @@ void Parser::DeclareFunctionNameVar(const AstRawString* function_name,
 //     !%_IsJSReceiver(result = Await(iterator.next())) &&
 //         %ThrowIteratorResultNotAnObject(result)
 // [endif]
-Expression* Parser::BuildIteratorNextResult(Expression* iterator,
+Expression* Parser::BuildIteratorNextResult(VariableProxy* iterator,
+                                            VariableProxy* next,
                                             Variable* result, IteratorType type,
                                             int pos) {
-  Expression* next_literal = factory()->NewStringLiteral(
-      ast_value_factory()->next_string(), kNoSourcePosition);
-  Expression* next_property =
-      factory()->NewProperty(iterator, next_literal, kNoSourcePosition);
+  Expression* next_property = factory()->NewResolvedProperty(iterator, next);
   ZoneList<Expression*>* next_arguments =
       new (zone()) ZoneList<Expression*>(0, zone());
   Expression* next_call =
@@ -2098,6 +2096,7 @@ Statement* Parser::InitializeForOfStatement(
   auto avfactory = ast_value_factory();
 
   Variable* iterator = NewTemporary(avfactory->dot_iterator_string());
+  Variable* next = NewTemporary(avfactory->empty_string());
   Variable* result = NewTemporary(avfactory->dot_result_string());
   Variable* completion = NewTemporary(avfactory->empty_string());
 
@@ -2110,6 +2109,17 @@ Statement* Parser::InitializeForOfStatement(
         iterable->position());
   }
 
+  Expression* assign_next;
+  {
+    assign_next = factory()->NewAssignment(
+        Token::ASSIGN, factory()->NewVariableProxy(next),
+        factory()->NewProperty(factory()->NewVariableProxy(iterator),
+                               factory()->NewStringLiteral(
+                                   avfactory->next_string(), kNoSourcePosition),
+                               kNoSourcePosition),
+        kNoSourcePosition);
+  }
+
   // [if (IteratorType == kNormal)]
   //     !%_IsJSReceiver(result = iterator.next()) &&
   //         %ThrowIteratorResultNotAnObject(result)
@@ -2119,9 +2129,10 @@ Statement* Parser::InitializeForOfStatement(
   // [endif]
   Expression* next_result;
   {
-    Expression* iterator_proxy = factory()->NewVariableProxy(iterator);
-    next_result =
-        BuildIteratorNextResult(iterator_proxy, result, type, next_result_pos);
+    VariableProxy* iterator_proxy = factory()->NewVariableProxy(iterator);
+    VariableProxy* next_proxy = factory()->NewVariableProxy(next);
+    next_result = BuildIteratorNextResult(iterator_proxy, next_proxy, result,
+                                          type, next_result_pos);
   }
 
   // result.done
@@ -2191,8 +2202,8 @@ Statement* Parser::InitializeForOfStatement(
     body = block;
   }
 
-  for_of->Initialize(body, iterator, assign_iterator, next_result, result_done,
-                     assign_each);
+  for_of->Initialize(body, iterator, assign_iterator, assign_next, next_result,
+                     result_done, assign_each);
   return finalize ? FinalizeForOfStatement(for_of, completion, type, nopos)
                   : for_of;
 }

src/parsing/parser.h

@@ -402,13 +402,14 @@ class V8_EXPORT_PRIVATE Parser : public NON_EXPORTED_BASE(ParserBase<Parser>) {
   Expression* RewriteDestructuringAssignment(Assignment* assignment);
 
   // [if (IteratorType == kAsync)]
-  //     !%_IsJSReceiver(result = Await(iterator.next()) &&
+  //     !%_IsJSReceiver(result = Await(next.[[Call]](iterator, « »)) &&
   //         %ThrowIteratorResultNotAnObject(result)
   // [else]
-  //     !%_IsJSReceiver(result = iterator.next()) &&
+  //     !%_IsJSReceiver(result = next.[[Call]](iterator, « »)) &&
   //         %ThrowIteratorResultNotAnObject(result)
   // [endif]
-  Expression* BuildIteratorNextResult(Expression* iterator, Variable* result,
+  Expression* BuildIteratorNextResult(VariableProxy* iterator,
+                                      VariableProxy* next, Variable* result,
                                       IteratorType type, int pos);
 
   // Initialize the components of a for-in / for-of statement.

src/parsing/pattern-rewriter.cc

@@ -445,6 +445,11 @@ void PatternRewriter::VisitArrayLiteral(ArrayLiteral* node,
   auto iterator = CreateTempVar(factory()->NewGetIterator(
       factory()->NewVariableProxy(temp), current_value_, IteratorType::kNormal,
       current_value_->position()));
+  auto next = CreateTempVar(factory()->NewProperty(
+      factory()->NewVariableProxy(iterator),
+      factory()->NewStringLiteral(ast_value_factory()->next_string(),
+                                  kNoSourcePosition),
+      kNoSourcePosition));
   auto done =
       CreateTempVar(factory()->NewBooleanLiteral(false, kNoSourcePosition));
   auto result = CreateTempVar();
@@ -525,7 +530,8 @@ void PatternRewriter::VisitArrayLiteral(ArrayLiteral* node,
       next_block->statements()->Add(
           factory()->NewExpressionStatement(
               parser_->BuildIteratorNextResult(
-                  factory()->NewVariableProxy(iterator), result,
+                  factory()->NewVariableProxy(iterator),
+                  factory()->NewVariableProxy(next), result,
                   IteratorType::kNormal, kNoSourcePosition),
               kNoSourcePosition),
           zone());
@@ -599,6 +605,7 @@ void PatternRewriter::VisitArrayLiteral(ArrayLiteral* node,
     // result = IteratorNext(iterator);
     Statement* get_next = factory()->NewExpressionStatement(
         parser_->BuildIteratorNextResult(factory()->NewVariableProxy(iterator),
+                                         factory()->NewVariableProxy(next),
                                          result, IteratorType::kNormal, nopos),
         nopos);
 
@@ -756,6 +763,7 @@ NOT_A_PATTERN(ImportCallExpression)
 NOT_A_PATTERN(Literal)
 NOT_A_PATTERN(NativeFunctionLiteral)
 NOT_A_PATTERN(RegExpLiteral)
+NOT_A_PATTERN(ResolvedProperty)
 NOT_A_PATTERN(ReturnStatement)
 NOT_A_PATTERN(SloppyBlockFunctionStatement)
 NOT_A_PATTERN(Spread)

test/cctest/interpreter/bytecode_expectations/AsyncGenerators.golden

@@ -290,257 +290,257 @@ snippet: "
   async function* f() { for (let x of [42]) yield x }
   f();
 "
-frame size: 22
+frame size: 23
 parameter count: 1
 bytecode array length: 557
 bytecodes: [
                 B(Ldar), R(2),
                 B(JumpIfUndefined), U8(18),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetContext), R(2), U8(1),
-                B(PushContext), R(11),
+                B(PushContext), R(12),
                 B(RestoreGeneratorState), R(2),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(SwitchOnSmiNoFeedback), U8(0), U8(3), I8(0),
                 B(Abort), U8(15),
                 B(LdaSmi), I8(-2),
-                B(Star), R(10),
-                B(Mov), R(closure), R(11),
-                B(Mov), R(this), R(12),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(11), U8(2),
+                B(Star), R(11),
+                B(Mov), R(closure), R(12),
+                B(Mov), R(this), R(13),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(12), U8(2),
                 B(Star), R(2),
   /*   17 E> */ B(StackCheck),
-                B(Mov), R(context), R(13),
                 B(Mov), R(context), R(14),
+                B(Mov), R(context), R(15),
                 B(Ldar), R(2),
-  /*   17 E> */ B(SuspendGenerator), R(2), R(0), U8(15), U8(0),
+  /*   17 E> */ B(SuspendGenerator), R(2), R(0), U8(16), U8(0),
   /*   50 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(15),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(16),
                 B(LdaSmi), I8(-2),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(15),
+                B(Star), R(16),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(SwitchOnSmiNoFeedback), U8(3), U8(2), I8(0),
-                B(Ldar), R(15),
+                B(Ldar), R(16),
   /*   17 E> */ B(Throw),
                 B(LdaZero),
-                B(Star), R(11),
-                B(Mov), R(15), R(12),
+                B(Star), R(12),
+                B(Mov), R(16), R(13),
                 B(JumpConstant), U8(20),
                 B(LdaZero),
-                B(Star), R(6),
-                B(Mov), R(context), R(17),
+                B(Star), R(7),
                 B(Mov), R(context), R(18),
+                B(Mov), R(context), R(19),
   /*   36 S> */ B(CreateArrayLiteral), U8(5), U8(0), U8(37),
-                B(Star), R(19),
-                B(LdaNamedProperty), R(19), U8(6), U8(1),
                 B(Star), R(20),
-                B(CallProperty0), R(20), R(19), U8(3),
+                B(LdaNamedProperty), R(20), U8(6), U8(1),
+                B(Star), R(21),
+                B(CallProperty0), R(21), R(20), U8(3),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(4),
-                B(Ldar), R(10),
-                B(SwitchOnSmiNoFeedback), U8(7), U8(1), I8(1),
+  /*   36 E> */ B(LdaNamedProperty), R(4), U8(7), U8(5),
+                B(Star), R(5),
+                B(Ldar), R(11),
+                B(SwitchOnSmiNoFeedback), U8(8), U8(1), I8(1),
                 B(LdaSmi), I8(-2),
-  /*   36 E> */ B(TestEqualStrictNoFeedback), R(10),
+                B(TestEqualStrictNoFeedback), R(11),
                 B(JumpIfTrue), U8(4),
                 B(Abort), U8(15),
-  /*   31 S> */ B(LdaNamedProperty), R(4), U8(8), U8(5),
-                B(Star), R(19),
-                B(CallProperty0), R(19), R(4), U8(7),
-                B(Star), R(5),
-  /*   31 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(5), U8(1),
+  /*   31 S> */ B(CallProperty0), R(5), R(4), U8(7),
+                B(Star), R(6),
+  /*   31 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(6), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(5), U8(1),
-                B(LdaNamedProperty), R(5), U8(9), U8(9),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
+                B(LdaNamedProperty), R(6), U8(9), U8(9),
                 B(JumpIfToBooleanTrue), U8(77),
-                B(LdaNamedProperty), R(5), U8(10), U8(11),
-                B(Star), R(7),
+                B(LdaNamedProperty), R(6), U8(10), U8(11),
+                B(Star), R(8),
                 B(LdaSmi), I8(2),
-                B(Star), R(6),
-                B(Mov), R(7), R(3),
+                B(Star), R(7),
+                B(Mov), R(8), R(3),
   /*   22 E> */ B(StackCheck),
                 B(Mov), R(3), R(0),
   /*   42 S> */ B(LdaFalse),
-                B(Star), R(21),
-                B(Mov), R(2), R(19),
-                B(Mov), R(0), R(20),
-                B(InvokeIntrinsic), U8(Runtime::k_AsyncGeneratorYield), R(19), U8(3),
-                B(SuspendGenerator), R(2), R(0), U8(19), U8(1),
+                B(Star), R(22),
+                B(Mov), R(2), R(20),
+                B(Mov), R(0), R(21),
+                B(InvokeIntrinsic), U8(Runtime::k_AsyncGeneratorYield), R(20), U8(3),
+                B(SuspendGenerator), R(2), R(0), U8(20), U8(1),
   /*   50 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(19),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(20),
                 B(LdaSmi), I8(-2),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(19),
+                B(Star), R(20),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(SwitchOnSmiNoFeedback), U8(11), U8(2), I8(0),
-                B(Ldar), R(19),
+                B(Ldar), R(20),
   /*   42 E> */ B(Throw),
                 B(LdaZero),
-                B(Star), R(15),
-                B(Mov), R(19), R(16),
+                B(Star), R(16),
+                B(Mov), R(20), R(17),
                 B(Jump), U8(62),
                 B(LdaZero),
-                B(Star), R(6),
-                B(JumpLoop), U8(116), I8(0),
+                B(Star), R(7),
+                B(JumpLoop), U8(110), I8(0),
                 B(Jump), U8(40),
-                B(Star), R(19),
+                B(Star), R(20),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(19), U8(13), U8(14),
-                B(Star), R(18),
+                B(CreateCatchContext), R(20), U8(13), U8(14),
+                B(Star), R(19),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(18),
-                B(PushContext), R(19),
+                B(Ldar), R(19),
+                B(PushContext), R(20),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(6), U8(13),
+                B(TestEqualStrict), R(7), U8(13),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(6),
+                B(Star), R(7),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(20),
-                B(CallRuntime), U16(Runtime::kReThrow), R(20), U8(1),
-                B(PopContext), R(19),
+                B(Star), R(21),
+                B(CallRuntime), U16(Runtime::kReThrow), R(21), U8(1),
+                B(PopContext), R(20),
                 B(LdaSmi), I8(-1),
+                B(Star), R(17),
                 B(Star), R(16),
-                B(Star), R(15),
                 B(Jump), U8(8),
-                B(Star), R(16),
+                B(Star), R(17),
                 B(LdaSmi), I8(1),
-                B(Star), R(15),
+                B(Star), R(16),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(17),
+                B(Star), R(18),
                 B(LdaZero),
-                B(TestEqualStrict), R(6), U8(14),
+                B(TestEqualStrict), R(7), U8(14),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(4), U8(15), U8(15),
-                B(Star), R(8),
+                B(Star), R(9),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(6), U8(17),
+                B(TestEqualStrict), R(7), U8(17),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(8),
+                B(Ldar), R(9),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(18),
-                B(LdaConstant), U8(16),
                 B(Star), R(19),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(18), U8(2),
+                B(LdaConstant), U8(16),
+                B(Star), R(20),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(19), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(18),
-                B(Mov), R(8), R(19),
-                B(Mov), R(4), R(20),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(19), U8(2),
+                B(Mov), R(context), R(19),
+                B(Mov), R(9), R(20),
+                B(Mov), R(4), R(21),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(20), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(18),
+                B(Ldar), R(19),
                 B(Jump), U8(27),
-                B(Mov), R(8), R(18),
-                B(Mov), R(4), R(19),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(18), U8(2),
-                B(Star), R(9),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(9), U8(1),
+                B(Mov), R(9), R(19),
+                B(Mov), R(4), R(20),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(19), U8(2),
+                B(Star), R(10),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(10), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1),
-                B(Ldar), R(17),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(10), U8(1),
+                B(Ldar), R(18),
                 B(SetPendingMessage),
-                B(Ldar), R(15),
+                B(Ldar), R(16),
                 B(SwitchOnSmiNoFeedback), U8(17), U8(2), I8(0),
                 B(Jump), U8(13),
                 B(LdaZero),
-                B(Star), R(11),
-                B(Mov), R(16), R(12),
+                B(Star), R(12),
+                B(Mov), R(17), R(13),
                 B(Jump), U8(110),
-                B(Ldar), R(16),
+                B(Ldar), R(17),
                 B(ReThrow),
                 B(LdaUndefined),
-                B(Star), R(16),
-                B(Mov), R(2), R(15),
-                B(CallJSRuntime), U8(%async_generator_await_uncaught), R(15), U8(2),
-                B(SuspendGenerator), R(2), R(0), U8(15), U8(2),
+                B(Star), R(17),
+                B(Mov), R(2), R(16),
+                B(CallJSRuntime), U8(%async_generator_await_uncaught), R(16), U8(2),
+                B(SuspendGenerator), R(2), R(0), U8(16), U8(2),
   /*   50 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(15),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(16),
                 B(LdaSmi), I8(-2),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(15),
-                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(Star), R(16),
+                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
+                B(Star), R(17),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(16),
+                B(TestEqualStrictNoFeedback), R(17),
                 B(JumpIfTrue), U8(5),
-                B(Ldar), R(15),
+                B(Ldar), R(16),
                 B(ReThrow),
                 B(LdaZero),
-                B(Star), R(11),
-                B(Mov), R(15), R(12),
+                B(Star), R(12),
+                B(Mov), R(16), R(13),
                 B(Jump), U8(55),
                 B(Jump), U8(39),
-                B(Star), R(15),
+                B(Star), R(16),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(15), U8(13), U8(19),
-                B(Star), R(14),
+                B(CreateCatchContext), R(16), U8(13), U8(19),
+                B(Star), R(15),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(14),
-                B(PushContext), R(15),
+                B(Ldar), R(15),
+                B(PushContext), R(16),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(17),
-                B(Mov), R(2), R(16),
-                B(InvokeIntrinsic), U8(Runtime::k_AsyncGeneratorReject), R(16), U8(2),
-                B(PopContext), R(15),
-                B(Star), R(12),
+                B(Star), R(18),
+                B(Mov), R(2), R(17),
+                B(InvokeIntrinsic), U8(Runtime::k_AsyncGeneratorReject), R(17), U8(2),
+                B(PopContext), R(16),
+                B(Star), R(13),
                 B(LdaSmi), I8(1),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(Jump), U8(16),
                 B(LdaSmi), I8(-1),
+                B(Star), R(13),
                 B(Star), R(12),
-                B(Star), R(11),
                 B(Jump), U8(8),
-                B(Star), R(12),
+                B(Star), R(13),
                 B(LdaSmi), I8(2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorClose), R(2), U8(1),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
                 B(SetPendingMessage),
-                B(Ldar), R(11),
+                B(Ldar), R(12),
                 B(SwitchOnSmiNoFeedback), U8(21), U8(3), I8(0),
                 B(Jump), U8(22),
                 B(LdaTrue),
-                B(Star), R(16),
-                B(Mov), R(2), R(14),
-                B(Mov), R(12), R(15),
-                B(InvokeIntrinsic), U8(Runtime::k_AsyncGeneratorResolve), R(14), U8(3),
+                B(Star), R(17),
+                B(Mov), R(2), R(15),
+                B(Mov), R(13), R(16),
+                B(InvokeIntrinsic), U8(Runtime::k_AsyncGeneratorResolve), R(15), U8(3),
   /*   50 S> */ B(Return),
-                B(Ldar), R(12),
+                B(Ldar), R(13),
   /*   50 S> */ B(Return),
-                B(Ldar), R(12),
+                B(Ldar), R(13),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   50 S> */ B(Return),
 ]
 constant pool: [
   Smi [37],
-  Smi [104],
+  Smi [110],
   Smi [413],
   Smi [15],
   Smi [7],
   TUPLE2_TYPE,
   SYMBOL_TYPE,
-  Smi [78],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
+  Smi [72],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
   Smi [15],
@@ -571,9 +571,9 @@ snippet: "
   async function* f() { yield* g() }
   f();
 "
-frame size: 17
+frame size: 18
 parameter count: 1
-bytecode array length: 560
+bytecode array length: 561
 bytecodes: [
                 B(Ldar), R(0),
                 B(JumpIfUndefined), U8(18),
@@ -609,44 +609,44 @@ bytecodes: [
                 B(Mov), R(6), R(3),
                 B(JumpConstant), U8(22),
   /*   49 S> */ B(LdaGlobal), U8(7), U8(0),
-                B(Star), R(12),
-  /*   56 E> */ B(CallUndefinedReceiver0), R(12), U8(2),
-                B(Star), R(10),
-                B(LdaNamedProperty), R(10), U8(8), U8(4),
+                B(Star), R(13),
+  /*   56 E> */ B(CallUndefinedReceiver0), R(13), U8(2),
+                B(Star), R(11),
+                B(LdaNamedProperty), R(11), U8(8), U8(4),
                 B(JumpIfUndefined), U8(17),
                 B(JumpIfNull), U8(15),
-                B(Star), R(11),
-                B(CallProperty0), R(11), R(10), U8(6),
+                B(Star), R(12),
+                B(CallProperty0), R(12), R(11), U8(6),
                 B(JumpIfJSReceiver), U8(23),
                 B(CallRuntime), U16(Runtime::kThrowSymbolAsyncIteratorInvalid), R(0), U8(0),
-                B(LdaNamedProperty), R(10), U8(9), U8(8),
-                B(Star), R(11),
-                B(CallProperty0), R(11), R(10), U8(10),
-                B(Star), R(11),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateAsyncFromSyncIterator), R(11), U8(1),
+                B(LdaNamedProperty), R(11), U8(9), U8(8),
+                B(Star), R(12),
+                B(CallProperty0), R(12), R(11), U8(10),
+                B(Star), R(12),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateAsyncFromSyncIterator), R(12), U8(1),
                 B(Star), R(8),
+                B(LdaNamedProperty), R(8), U8(10), U8(12),
+                B(Star), R(10),
                 B(LdaUndefined),
                 B(Star), R(9),
                 B(LdaZero),
                 B(Star), R(7),
                 B(Ldar), R(1),
-                B(SwitchOnSmiNoFeedback), U8(10), U8(3), I8(1),
+                B(SwitchOnSmiNoFeedback), U8(11), U8(3), I8(1),
                 B(LdaSmi), I8(-2),
                 B(TestEqualStrictNoFeedback), R(1),
                 B(JumpIfTrue), U8(4),
                 B(Abort), U8(15),
                 B(Ldar), R(7),
-                B(SwitchOnSmiNoFeedback), U8(13), U8(2), I8(1),
-                B(LdaNamedProperty), R(8), U8(15), U8(12),
-                B(Star), R(12),
-                B(CallProperty1), R(12), R(8), R(9), U8(14),
-                B(Jump), U8(118),
+                B(SwitchOnSmiNoFeedback), U8(14), U8(2), I8(1),
+                B(CallProperty1), R(10), R(8), R(9), U8(14),
+                B(Jump), U8(119),
                 B(LdaNamedProperty), R(8), U8(16), U8(16),
                 B(JumpIfUndefined), U8(13),
                 B(JumpIfNull), U8(11),
-                B(Star), R(12),
-                B(CallProperty1), R(12), R(8), R(9), U8(18),
-                B(Jump), U8(101),
+                B(Star), R(13),
+                B(CallProperty1), R(13), R(8), R(9), U8(18),
+                B(Jump), U8(102),
                 B(LdaZero),
                 B(Star), R(2),
                 B(Mov), R(9), R(3),
@@ -654,14 +654,15 @@ bytecodes: [
                 B(LdaNamedProperty), R(8), U8(17), U8(20),
                 B(JumpIfUndefined), U8(13),
                 B(JumpIfNull), U8(11),
-                B(Star), R(12),
-                B(CallProperty1), R(12), R(8), R(9), U8(22),
-                B(Jump), U8(76),
+                B(Star), R(13),
+                B(CallProperty1), R(13), R(8), R(9), U8(22),
+                B(Jump), U8(77),
                 B(LdaNamedProperty), R(8), U8(16), U8(24),
-                B(Star), R(12),
-                B(JumpIfUndefined), U8(63),
-                B(JumpIfNull), U8(61),
-                B(CallProperty0), R(12), R(8), U8(26),
+                B(JumpIfUndefined), U8(66),
+                B(JumpIfNull), U8(64),
+                B(Star), R(13),
+                B(CallProperty0), R(13), R(8), U8(26),
+                B(Jump), U8(2),
                 B(Star), R(14),
                 B(Mov), R(0), R(13),
                 B(CallJSRuntime), U8(%async_generator_await_uncaught), R(13), U8(2),
@@ -680,49 +681,49 @@ bytecodes: [
                 B(Ldar), R(13),
                 B(ReThrow),
                 B(Ldar), R(13),
-                B(Mov), R(13), R(6),
-                B(JumpIfJSReceiver), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
+                B(JumpIfJSReceiver), U8(9),
+                B(Star), R(15),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(15), U8(1),
                 B(CallRuntime), U16(Runtime::kThrowThrowMethodMissing), R(0), U8(0),
-                B(Star), R(13),
-                B(Mov), R(0), R(12),
-                B(CallJSRuntime), U8(%async_generator_await_uncaught), R(12), U8(2),
-                B(SuspendGenerator), R(0), R(0), U8(12), U8(3),
+                B(Star), R(14),
+                B(Mov), R(0), R(13),
+                B(CallJSRuntime), U8(%async_generator_await_uncaught), R(13), U8(2),
+                B(SuspendGenerator), R(0), R(0), U8(13), U8(3),
   /*   60 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(0), R(0), U8(12),
+                B(RestoreGeneratorRegisters), R(0), R(0), U8(13),
                 B(LdaSmi), I8(-2),
                 B(Star), R(1),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(0), U8(1),
-                B(Star), R(12),
-                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(0), U8(1),
                 B(Star), R(13),
+                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(0), U8(1),
+                B(Star), R(14),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(13),
+                B(TestEqualStrictNoFeedback), R(14),
                 B(JumpIfTrue), U8(5),
-                B(Ldar), R(12),
+                B(Ldar), R(13),
                 B(ReThrow),
-                B(Ldar), R(12),
-                B(Mov), R(12), R(6),
+                B(Ldar), R(13),
+                B(Mov), R(13), R(6),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
                 B(LdaNamedProperty), R(6), U8(18), U8(28),
                 B(JumpIfToBooleanTrue), U8(47),
                 B(LdaNamedProperty), R(6), U8(19), U8(30),
-                B(Star), R(15),
-                B(LdaFalse),
                 B(Star), R(16),
-                B(Mov), R(0), R(14),
-                B(InvokeIntrinsic), U8(Runtime::k_AsyncGeneratorYield), R(14), U8(3),
-                B(SuspendGenerator), R(0), R(0), U8(14), U8(1),
+                B(LdaFalse),
+                B(Star), R(17),
+                B(Mov), R(0), R(15),
+                B(InvokeIntrinsic), U8(Runtime::k_AsyncGeneratorYield), R(15), U8(3),
+                B(SuspendGenerator), R(0), R(0), U8(15), U8(1),
   /*   60 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(0), R(0), U8(14),
+                B(RestoreGeneratorRegisters), R(0), R(0), U8(15),
                 B(LdaSmi), I8(-2),
                 B(Star), R(1),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(0), U8(1),
                 B(Star), R(9),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(0), U8(1),
                 B(Star), R(7),
-                B(JumpLoop), U8(252), I8(0),
+                B(JumpLoop), U8(247), I8(0),
                 B(LdaNamedProperty), R(6), U8(19), U8(32),
                 B(Star), R(8),
                 B(LdaSmi), I8(1),
@@ -803,35 +804,35 @@ bytecodes: [
 ]
 constant pool: [
   Smi [37],
-  Smi [125],
-  Smi [125],
-  Smi [125],
-  Smi [416],
+  Smi [131],
+  Smi [131],
+  Smi [131],
+  Smi [417],
   Smi [15],
   Smi [7],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["g"],
   SYMBOL_TYPE,
   SYMBOL_TYPE,
-  Smi [230],
-  Smi [102],
-  Smi [162],
-  Smi [17],
-  Smi [42],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
+  Smi [225],
+  Smi [98],
+  Smi [157],
+  Smi [11],
+  Smi [36],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["return"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["throw"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE [".catch"],
   FIXED_ARRAY_TYPE,
-  Smi [437],
-  Smi [324],
+  Smi [438],
+  Smi [325],
   Smi [6],
   Smi [20],
   Smi [23],
 ]
 handlers: [
-  [40, 505, 513],
-  [43, 466, 468],
+  [40, 506, 514],
+  [43, 467, 469],
 ]
 

test/cctest/interpreter/bytecode_expectations/ForAwaitOf.golden

@@ -14,262 +14,262 @@ snippet: "
   }
   f();
 "
-frame size: 23
+frame size: 24
 parameter count: 1
 bytecode array length: 575
 bytecodes: [
                 B(Ldar), R(2),
                 B(JumpIfUndefined), U8(18),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetContext), R(2), U8(1),
-                B(PushContext), R(12),
+                B(PushContext), R(13),
                 B(RestoreGeneratorState), R(2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(SwitchOnSmiNoFeedback), U8(0), U8(3), I8(0),
                 B(Abort), U8(15),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
-                B(Mov), R(closure), R(12),
-                B(Mov), R(this), R(13),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(12), U8(2),
+                B(Star), R(12),
+                B(Mov), R(closure), R(13),
+                B(Mov), R(this), R(14),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(13), U8(2),
                 B(Star), R(2),
   /*   16 E> */ B(StackCheck),
                 B(CallJSRuntime), U8(%async_function_promise_create), R(0), U8(0),
-                B(Star), R(10),
-                B(Mov), R(context), R(14),
+                B(Star), R(11),
                 B(Mov), R(context), R(15),
+                B(Mov), R(context), R(16),
                 B(LdaZero),
-                B(Star), R(6),
-                B(Mov), R(context), R(18),
+                B(Star), R(7),
                 B(Mov), R(context), R(19),
+                B(Mov), R(context), R(20),
   /*   43 S> */ B(CreateArrayLiteral), U8(3), U8(0), U8(37),
-                B(Star), R(20),
-                B(LdaNamedProperty), R(20), U8(4), U8(1),
+                B(Star), R(21),
+                B(LdaNamedProperty), R(21), U8(4), U8(1),
                 B(JumpIfUndefined), U8(17),
                 B(JumpIfNull), U8(15),
-                B(Star), R(21),
-                B(CallProperty0), R(21), R(20), U8(3),
+                B(Star), R(22),
+                B(CallProperty0), R(22), R(21), U8(3),
                 B(JumpIfJSReceiver), U8(23),
                 B(CallRuntime), U16(Runtime::kThrowSymbolAsyncIteratorInvalid), R(0), U8(0),
-                B(LdaNamedProperty), R(20), U8(5), U8(5),
-                B(Star), R(21),
-                B(CallProperty0), R(21), R(20), U8(7),
-                B(Star), R(21),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateAsyncFromSyncIterator), R(21), U8(1),
+                B(LdaNamedProperty), R(21), U8(5), U8(5),
+                B(Star), R(22),
+                B(CallProperty0), R(22), R(21), U8(7),
+                B(Star), R(22),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateAsyncFromSyncIterator), R(22), U8(1),
                 B(Star), R(4),
-                B(Ldar), R(11),
-                B(SwitchOnSmiNoFeedback), U8(6), U8(1), I8(0),
+  /*   43 E> */ B(LdaNamedProperty), R(4), U8(6), U8(9),
+                B(Star), R(5),
+                B(Ldar), R(12),
+                B(SwitchOnSmiNoFeedback), U8(7), U8(1), I8(0),
                 B(LdaSmi), I8(-2),
-  /*   43 E> */ B(TestEqualStrictNoFeedback), R(11),
+                B(TestEqualStrictNoFeedback), R(12),
                 B(JumpIfTrue), U8(4),
                 B(Abort), U8(15),
-  /*   40 S> */ B(LdaNamedProperty), R(4), U8(7), U8(9),
-                B(Star), R(20),
-                B(CallProperty0), R(20), R(4), U8(11),
-                B(Star), R(21),
-                B(Mov), R(2), R(20),
-                B(Mov), R(10), R(22),
-                B(CallJSRuntime), U8(%async_function_await_uncaught), R(20), U8(3),
-                B(SuspendGenerator), R(2), R(0), U8(20), U8(0),
+  /*   40 S> */ B(CallProperty0), R(5), R(4), U8(11),
+                B(Star), R(22),
+                B(Mov), R(2), R(21),
+                B(Mov), R(11), R(23),
+                B(CallJSRuntime), U8(%async_function_await_uncaught), R(21), U8(3),
+                B(SuspendGenerator), R(2), R(0), U8(21), U8(0),
   /*   57 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(20),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(21),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(20),
-                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(Star), R(21),
+                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
+                B(Star), R(22),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(21),
+                B(TestEqualStrictNoFeedback), R(22),
                 B(JumpIfTrue), U8(5),
-                B(Ldar), R(20),
+                B(Ldar), R(21),
                 B(ReThrow),
-                B(Mov), R(20), R(5),
-  /*   40 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(20), U8(1),
+                B(Mov), R(21), R(6),
+  /*   40 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(21), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(5), U8(1),
-                B(LdaNamedProperty), R(5), U8(8), U8(13),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
+                B(LdaNamedProperty), R(6), U8(8), U8(13),
                 B(JumpIfToBooleanTrue), U8(25),
-                B(LdaNamedProperty), R(5), U8(9), U8(15),
-                B(Star), R(7),
+                B(LdaNamedProperty), R(6), U8(9), U8(15),
+                B(Star), R(8),
                 B(LdaSmi), I8(2),
-                B(Star), R(6),
-                B(Mov), R(7), R(3),
+                B(Star), R(7),
+                B(Mov), R(8), R(3),
   /*   23 E> */ B(StackCheck),
                 B(Mov), R(3), R(0),
                 B(LdaZero),
-                B(Star), R(6),
-                B(JumpLoop), U8(111), I8(0),
+                B(Star), R(7),
+                B(JumpLoop), U8(105), I8(0),
                 B(Jump), U8(40),
-                B(Star), R(20),
+                B(Star), R(21),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(20), U8(10), U8(11),
-                B(Star), R(19),
+                B(CreateCatchContext), R(21), U8(10), U8(11),
+                B(Star), R(20),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(19),
-                B(PushContext), R(20),
+                B(Ldar), R(20),
+                B(PushContext), R(21),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(6), U8(17),
+                B(TestEqualStrict), R(7), U8(17),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(6),
+                B(Star), R(7),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(21),
-                B(CallRuntime), U16(Runtime::kReThrow), R(21), U8(1),
-                B(PopContext), R(20),
+                B(Star), R(22),
+                B(CallRuntime), U16(Runtime::kReThrow), R(22), U8(1),
+                B(PopContext), R(21),
                 B(LdaSmi), I8(-1),
+                B(Star), R(18),
                 B(Star), R(17),
-                B(Star), R(16),
                 B(Jump), U8(7),
-                B(Star), R(17),
+                B(Star), R(18),
                 B(LdaZero),
-                B(Star), R(16),
+                B(Star), R(17),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(18),
+                B(Star), R(19),
                 B(LdaZero),
-                B(TestEqualStrict), R(6), U8(18),
+                B(TestEqualStrict), R(7), U8(18),
                 B(JumpIfTrue), U8(185),
                 B(LdaNamedProperty), R(4), U8(12), U8(19),
-                B(Star), R(8),
+                B(Star), R(9),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(174),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(6), U8(21),
+                B(TestEqualStrict), R(7), U8(21),
                 B(JumpIfFalse), U8(95),
-                B(Ldar), R(8),
+                B(Ldar), R(9),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(19),
-                B(LdaConstant), U8(13),
                 B(Star), R(20),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(19), U8(2),
-                B(Throw),
-                B(Mov), R(context), R(19),
-                B(Mov), R(8), R(20),
-                B(Mov), R(4), R(21),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(20), U8(2),
+                B(LdaConstant), U8(13),
                 B(Star), R(21),
-                B(Mov), R(2), R(20),
-                B(Mov), R(10), R(22),
-                B(CallJSRuntime), U8(%async_function_await_caught), R(20), U8(3),
-                B(SuspendGenerator), R(2), R(0), U8(20), U8(1),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(20), U8(2),
+                B(Throw),
+                B(Mov), R(context), R(20),
+                B(Mov), R(9), R(21),
+                B(Mov), R(4), R(22),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(21), U8(2),
+                B(Star), R(22),
+                B(Mov), R(2), R(21),
+                B(Mov), R(11), R(23),
+                B(CallJSRuntime), U8(%async_function_await_caught), R(21), U8(3),
+                B(SuspendGenerator), R(2), R(0), U8(21), U8(1),
   /*   57 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(20),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(21),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(20),
-                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(Star), R(21),
+                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
+                B(Star), R(22),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(21),
+                B(TestEqualStrictNoFeedback), R(22),
                 B(JumpIfTrue), U8(5),
-                B(Ldar), R(20),
+                B(Ldar), R(21),
                 B(ReThrow),
-                B(Ldar), R(20),
+                B(Ldar), R(21),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(19),
+                B(Ldar), R(20),
                 B(Jump), U8(74),
-                B(Mov), R(8), R(19),
-                B(Mov), R(4), R(20),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(19), U8(2),
-                B(Star), R(20),
-                B(Mov), R(2), R(19),
-                B(Mov), R(10), R(21),
-                B(CallJSRuntime), U8(%async_function_await_uncaught), R(19), U8(3),
-                B(SuspendGenerator), R(2), R(0), U8(19), U8(2),
+                B(Mov), R(9), R(20),
+                B(Mov), R(4), R(21),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(20), U8(2),
+                B(Star), R(21),
+                B(Mov), R(2), R(20),
+                B(Mov), R(11), R(22),
+                B(CallJSRuntime), U8(%async_function_await_uncaught), R(20), U8(3),
+                B(SuspendGenerator), R(2), R(0), U8(20), U8(2),
   /*   57 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(19),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(20),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(19),
-                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(Star), R(20),
+                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
+                B(Star), R(21),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(20),
+                B(TestEqualStrictNoFeedback), R(21),
                 B(JumpIfTrue), U8(5),
-                B(Ldar), R(19),
+                B(Ldar), R(20),
                 B(ReThrow),
-                B(Mov), R(19), R(9),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(19), U8(1),
+                B(Mov), R(20), R(10),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(20), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1),
-                B(Ldar), R(18),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(10), U8(1),
+                B(Ldar), R(19),
                 B(SetPendingMessage),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(16),
+                B(TestEqualStrictNoFeedback), R(17),
                 B(JumpIfFalse), U8(5),
-                B(Ldar), R(17),
+                B(Ldar), R(18),
                 B(ReThrow),
                 B(LdaUndefined),
-                B(Star), R(17),
-                B(Mov), R(10), R(16),
-                B(CallJSRuntime), U8(%promise_resolve), R(16), U8(2),
+                B(Star), R(18),
+                B(Mov), R(11), R(17),
+                B(CallJSRuntime), U8(%promise_resolve), R(17), U8(2),
                 B(LdaZero),
-                B(Star), R(12),
-                B(Mov), R(10), R(13),
+                B(Star), R(13),
+                B(Mov), R(11), R(14),
                 B(Jump), U8(58),
                 B(Jump), U8(42),
-                B(Star), R(16),
+                B(Star), R(17),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(16), U8(10), U8(14),
-                B(Star), R(15),
+                B(CreateCatchContext), R(17), U8(10), U8(14),
+                B(Star), R(16),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(15),
-                B(PushContext), R(16),
+                B(Ldar), R(16),
+                B(PushContext), R(17),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(18),
-                B(LdaFalse),
                 B(Star), R(19),
-                B(Mov), R(10), R(17),
-                B(CallJSRuntime), U8(%promise_internal_reject), R(17), U8(3),
-                B(PopContext), R(16),
+                B(LdaFalse),
+                B(Star), R(20),
+                B(Mov), R(11), R(18),
+                B(CallJSRuntime), U8(%promise_internal_reject), R(18), U8(3),
+                B(PopContext), R(17),
                 B(LdaZero),
-                B(Star), R(12),
-                B(Mov), R(10), R(13),
+                B(Star), R(13),
+                B(Mov), R(11), R(14),
                 B(Jump), U8(16),
                 B(LdaSmi), I8(-1),
+                B(Star), R(14),
                 B(Star), R(13),
-                B(Star), R(12),
                 B(Jump), U8(8),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(LdaSmi), I8(1),
-                B(Star), R(12),
+                B(Star), R(13),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(14),
-                B(CallJSRuntime), U8(%async_function_promise_release), R(10), U8(1),
-                B(Ldar), R(14),
+                B(Star), R(15),
+                B(CallJSRuntime), U8(%async_function_promise_release), R(11), U8(1),
+                B(Ldar), R(15),
                 B(SetPendingMessage),
-                B(Ldar), R(12),
+                B(Ldar), R(13),
                 B(SwitchOnSmiNoFeedback), U8(15), U8(2), I8(0),
                 B(Jump), U8(8),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
   /*   57 S> */ B(Return),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   57 S> */ B(Return),
 ]
 constant pool: [
-  Smi [89],
+  Smi [95],
   Smi [339],
   Smi [405],
   TUPLE2_TYPE,
   SYMBOL_TYPE,
   SYMBOL_TYPE,
-  Smi [40],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
+  Smi [34],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE [".catch"],
@@ -295,272 +295,272 @@ snippet: "
   }
   f();
 "
-frame size: 23
+frame size: 24
 parameter count: 1
 bytecode array length: 604
 bytecodes: [
                 B(Ldar), R(2),
                 B(JumpIfUndefined), U8(18),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetContext), R(2), U8(1),
-                B(PushContext), R(12),
+                B(PushContext), R(13),
                 B(RestoreGeneratorState), R(2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(SwitchOnSmiNoFeedback), U8(0), U8(3), I8(0),
                 B(Abort), U8(15),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
-                B(Mov), R(closure), R(12),
-                B(Mov), R(this), R(13),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(12), U8(2),
+                B(Star), R(12),
+                B(Mov), R(closure), R(13),
+                B(Mov), R(this), R(14),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(13), U8(2),
                 B(Star), R(2),
   /*   16 E> */ B(StackCheck),
                 B(CallJSRuntime), U8(%async_function_promise_create), R(0), U8(0),
-                B(Star), R(10),
-                B(Mov), R(context), R(14),
+                B(Star), R(11),
                 B(Mov), R(context), R(15),
+                B(Mov), R(context), R(16),
                 B(LdaZero),
-                B(Star), R(6),
-                B(Mov), R(context), R(18),
+                B(Star), R(7),
                 B(Mov), R(context), R(19),
+                B(Mov), R(context), R(20),
   /*   43 S> */ B(CreateArrayLiteral), U8(3), U8(0), U8(37),
-                B(Star), R(20),
-                B(LdaNamedProperty), R(20), U8(4), U8(1),
+                B(Star), R(21),
+                B(LdaNamedProperty), R(21), U8(4), U8(1),
                 B(JumpIfUndefined), U8(17),
                 B(JumpIfNull), U8(15),
-                B(Star), R(21),
-                B(CallProperty0), R(21), R(20), U8(3),
+                B(Star), R(22),
+                B(CallProperty0), R(22), R(21), U8(3),
                 B(JumpIfJSReceiver), U8(23),
                 B(CallRuntime), U16(Runtime::kThrowSymbolAsyncIteratorInvalid), R(0), U8(0),
-                B(LdaNamedProperty), R(20), U8(5), U8(5),
-                B(Star), R(21),
-                B(CallProperty0), R(21), R(20), U8(7),
-                B(Star), R(21),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateAsyncFromSyncIterator), R(21), U8(1),
+                B(LdaNamedProperty), R(21), U8(5), U8(5),
+                B(Star), R(22),
+                B(CallProperty0), R(22), R(21), U8(7),
+                B(Star), R(22),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateAsyncFromSyncIterator), R(22), U8(1),
                 B(Star), R(4),
-                B(Ldar), R(11),
-                B(SwitchOnSmiNoFeedback), U8(6), U8(1), I8(0),
+  /*   43 E> */ B(LdaNamedProperty), R(4), U8(6), U8(9),
+                B(Star), R(5),
+                B(Ldar), R(12),
+                B(SwitchOnSmiNoFeedback), U8(7), U8(1), I8(0),
                 B(LdaSmi), I8(-2),
-  /*   43 E> */ B(TestEqualStrictNoFeedback), R(11),
+                B(TestEqualStrictNoFeedback), R(12),
                 B(JumpIfTrue), U8(4),
                 B(Abort), U8(15),
-  /*   40 S> */ B(LdaNamedProperty), R(4), U8(7), U8(9),
-                B(Star), R(20),
-                B(CallProperty0), R(20), R(4), U8(11),
-                B(Star), R(21),
-                B(Mov), R(2), R(20),
-                B(Mov), R(10), R(22),
-                B(CallJSRuntime), U8(%async_function_await_uncaught), R(20), U8(3),
-                B(SuspendGenerator), R(2), R(0), U8(20), U8(0),
+  /*   40 S> */ B(CallProperty0), R(5), R(4), U8(11),
+                B(Star), R(22),
+                B(Mov), R(2), R(21),
+                B(Mov), R(11), R(23),
+                B(CallJSRuntime), U8(%async_function_await_uncaught), R(21), U8(3),
+                B(SuspendGenerator), R(2), R(0), U8(21), U8(0),
   /*   68 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(20),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(21),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(20),
-                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(Star), R(21),
+                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
+                B(Star), R(22),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(21),
+                B(TestEqualStrictNoFeedback), R(22),
                 B(JumpIfTrue), U8(5),
-                B(Ldar), R(20),
+                B(Ldar), R(21),
                 B(ReThrow),
-                B(Mov), R(20), R(5),
-  /*   40 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(20), U8(1),
+                B(Mov), R(21), R(6),
+  /*   40 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(21), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(5), U8(1),
-                B(LdaNamedProperty), R(5), U8(8), U8(13),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
+                B(LdaNamedProperty), R(6), U8(8), U8(13),
                 B(JumpIfToBooleanTrue), U8(27),
-                B(LdaNamedProperty), R(5), U8(9), U8(15),
-                B(Star), R(7),
+                B(LdaNamedProperty), R(6), U8(9), U8(15),
+                B(Star), R(8),
                 B(LdaSmi), I8(2),
-                B(Star), R(6),
-                B(Mov), R(7), R(3),
+                B(Star), R(7),
+                B(Mov), R(8), R(3),
   /*   23 E> */ B(StackCheck),
                 B(Mov), R(3), R(0),
   /*   56 S> */ B(LdaZero),
-                B(Star), R(16),
-                B(Mov), R(7), R(17),
+                B(Star), R(17),
+                B(Mov), R(8), R(18),
                 B(Jump), U8(56),
                 B(Jump), U8(40),
-                B(Star), R(20),
+                B(Star), R(21),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(20), U8(10), U8(11),
-                B(Star), R(19),
+                B(CreateCatchContext), R(21), U8(10), U8(11),
+                B(Star), R(20),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(19),
-                B(PushContext), R(20),
+                B(Ldar), R(20),
+                B(PushContext), R(21),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(6), U8(17),
+                B(TestEqualStrict), R(7), U8(17),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(6),
+                B(Star), R(7),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(21),
-                B(CallRuntime), U16(Runtime::kReThrow), R(21), U8(1),
-                B(PopContext), R(20),
+                B(Star), R(22),
+                B(CallRuntime), U16(Runtime::kReThrow), R(22), U8(1),
+                B(PopContext), R(21),
                 B(LdaSmi), I8(-1),
+                B(Star), R(18),
                 B(Star), R(17),
-                B(Star), R(16),
                 B(Jump), U8(8),
-                B(Star), R(17),
+                B(Star), R(18),
                 B(LdaSmi), I8(1),
-                B(Star), R(16),
+                B(Star), R(17),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(18),
+                B(Star), R(19),
                 B(LdaZero),
-                B(TestEqualStrict), R(6), U8(18),
+                B(TestEqualStrict), R(7), U8(18),
                 B(JumpIfTrue), U8(185),
                 B(LdaNamedProperty), R(4), U8(12), U8(19),
-                B(Star), R(8),
+                B(Star), R(9),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(174),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(6), U8(21),
+                B(TestEqualStrict), R(7), U8(21),
                 B(JumpIfFalse), U8(95),
-                B(Ldar), R(8),
+                B(Ldar), R(9),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(19),
-                B(LdaConstant), U8(13),
                 B(Star), R(20),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(19), U8(2),
-                B(Throw),
-                B(Mov), R(context), R(19),
-                B(Mov), R(8), R(20),
-                B(Mov), R(4), R(21),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(20), U8(2),
+                B(LdaConstant), U8(13),
                 B(Star), R(21),
-                B(Mov), R(2), R(20),
-                B(Mov), R(10), R(22),
-                B(CallJSRuntime), U8(%async_function_await_caught), R(20), U8(3),
-                B(SuspendGenerator), R(2), R(0), U8(20), U8(1),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(20), U8(2),
+                B(Throw),
+                B(Mov), R(context), R(20),
+                B(Mov), R(9), R(21),
+                B(Mov), R(4), R(22),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(21), U8(2),
+                B(Star), R(22),
+                B(Mov), R(2), R(21),
+                B(Mov), R(11), R(23),
+                B(CallJSRuntime), U8(%async_function_await_caught), R(21), U8(3),
+                B(SuspendGenerator), R(2), R(0), U8(21), U8(1),
   /*   68 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(20),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(21),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(20),
-                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(Star), R(21),
+                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
+                B(Star), R(22),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(21),
+                B(TestEqualStrictNoFeedback), R(22),
                 B(JumpIfTrue), U8(5),
-                B(Ldar), R(20),
+                B(Ldar), R(21),
                 B(ReThrow),
-                B(Ldar), R(20),
+                B(Ldar), R(21),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(19),
+                B(Ldar), R(20),
                 B(Jump), U8(74),
-                B(Mov), R(8), R(19),
-                B(Mov), R(4), R(20),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(19), U8(2),
-                B(Star), R(20),
-                B(Mov), R(2), R(19),
-                B(Mov), R(10), R(21),
-                B(CallJSRuntime), U8(%async_function_await_uncaught), R(19), U8(3),
-                B(SuspendGenerator), R(2), R(0), U8(19), U8(2),
+                B(Mov), R(9), R(20),
+                B(Mov), R(4), R(21),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(20), U8(2),
+                B(Star), R(21),
+                B(Mov), R(2), R(20),
+                B(Mov), R(11), R(22),
+                B(CallJSRuntime), U8(%async_function_await_uncaught), R(20), U8(3),
+                B(SuspendGenerator), R(2), R(0), U8(20), U8(2),
   /*   68 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(19),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(20),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(19),
-                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(Star), R(20),
+                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
+                B(Star), R(21),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(20),
+                B(TestEqualStrictNoFeedback), R(21),
                 B(JumpIfTrue), U8(5),
-                B(Ldar), R(19),
+                B(Ldar), R(20),
                 B(ReThrow),
-                B(Mov), R(19), R(9),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(19), U8(1),
+                B(Mov), R(20), R(10),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(20), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1),
-                B(Ldar), R(18),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(10), U8(1),
+                B(Ldar), R(19),
                 B(SetPendingMessage),
-                B(Ldar), R(16),
+                B(Ldar), R(17),
                 B(SwitchOnSmiNoFeedback), U8(14), U8(2), I8(0),
                 B(Jump), U8(13),
                 B(LdaZero),
-                B(Star), R(12),
-                B(Mov), R(17), R(13),
+                B(Star), R(13),
+                B(Mov), R(18), R(14),
                 B(Jump), U8(81),
-                B(Ldar), R(17),
+                B(Ldar), R(18),
                 B(ReThrow),
                 B(LdaUndefined),
-                B(Star), R(17),
-                B(Mov), R(10), R(16),
-                B(CallJSRuntime), U8(%promise_resolve), R(16), U8(2),
+                B(Star), R(18),
+                B(Mov), R(11), R(17),
+                B(CallJSRuntime), U8(%promise_resolve), R(17), U8(2),
                 B(LdaSmi), I8(1),
-                B(Star), R(12),
-                B(Mov), R(10), R(13),
+                B(Star), R(13),
+                B(Mov), R(11), R(14),
                 B(Jump), U8(59),
                 B(Jump), U8(43),
-                B(Star), R(16),
+                B(Star), R(17),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(16), U8(10), U8(16),
-                B(Star), R(15),
+                B(CreateCatchContext), R(17), U8(10), U8(16),
+                B(Star), R(16),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(15),
-                B(PushContext), R(16),
+                B(Ldar), R(16),
+                B(PushContext), R(17),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(18),
-                B(LdaFalse),
                 B(Star), R(19),
-                B(Mov), R(10), R(17),
-                B(CallJSRuntime), U8(%promise_internal_reject), R(17), U8(3),
-                B(PopContext), R(16),
+                B(LdaFalse),
+                B(Star), R(20),
+                B(Mov), R(11), R(18),
+                B(CallJSRuntime), U8(%promise_internal_reject), R(18), U8(3),
+                B(PopContext), R(17),
                 B(LdaSmi), I8(1),
-                B(Star), R(12),
-                B(Mov), R(10), R(13),
+                B(Star), R(13),
+                B(Mov), R(11), R(14),
                 B(Jump), U8(16),
                 B(LdaSmi), I8(-1),
+                B(Star), R(14),
                 B(Star), R(13),
-                B(Star), R(12),
                 B(Jump), U8(8),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(LdaSmi), I8(2),
-                B(Star), R(12),
+                B(Star), R(13),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(14),
-                B(CallJSRuntime), U8(%async_function_promise_release), R(10), U8(1),
-                B(Ldar), R(14),
+                B(Star), R(15),
+                B(CallJSRuntime), U8(%async_function_promise_release), R(11), U8(1),
+                B(Ldar), R(15),
                 B(SetPendingMessage),
-                B(Ldar), R(12),
+                B(Ldar), R(13),
                 B(SwitchOnSmiNoFeedback), U8(17), U8(3), I8(0),
                 B(Jump), U8(21),
-                B(Mov), R(10), R(15),
-                B(Mov), R(13), R(16),
-                B(CallJSRuntime), U8(%promise_resolve), R(15), U8(2),
-                B(Ldar), R(10),
+                B(Mov), R(11), R(16),
+                B(Mov), R(14), R(17),
+                B(CallJSRuntime), U8(%promise_resolve), R(16), U8(2),
+                B(Ldar), R(11),
   /*   68 S> */ B(Return),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
   /*   68 S> */ B(Return),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   68 S> */ B(Return),
 ]
 constant pool: [
-  Smi [89],
+  Smi [95],
   Smi [342],
   Smi [408],
   TUPLE2_TYPE,
   SYMBOL_TYPE,
   SYMBOL_TYPE,
-  Smi [40],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
+  Smi [34],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE [".catch"],
@@ -592,87 +592,87 @@ snippet: "
   }
   f();
 "
-frame size: 23
+frame size: 24
 parameter count: 1
 bytecode array length: 593
 bytecodes: [
                 B(Ldar), R(2),
                 B(JumpIfUndefined), U8(18),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetContext), R(2), U8(1),
-                B(PushContext), R(12),
+                B(PushContext), R(13),
                 B(RestoreGeneratorState), R(2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(SwitchOnSmiNoFeedback), U8(0), U8(3), I8(0),
                 B(Abort), U8(15),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
-                B(Mov), R(closure), R(12),
-                B(Mov), R(this), R(13),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(12), U8(2),
+                B(Star), R(12),
+                B(Mov), R(closure), R(13),
+                B(Mov), R(this), R(14),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(13), U8(2),
                 B(Star), R(2),
   /*   16 E> */ B(StackCheck),
                 B(CallJSRuntime), U8(%async_function_promise_create), R(0), U8(0),
-                B(Star), R(10),
-                B(Mov), R(context), R(14),
+                B(Star), R(11),
                 B(Mov), R(context), R(15),
+                B(Mov), R(context), R(16),
                 B(LdaZero),
-                B(Star), R(6),
-                B(Mov), R(context), R(18),
+                B(Star), R(7),
                 B(Mov), R(context), R(19),
+                B(Mov), R(context), R(20),
   /*   43 S> */ B(CreateArrayLiteral), U8(3), U8(0), U8(37),
-                B(Star), R(20),
-                B(LdaNamedProperty), R(20), U8(4), U8(1),
+                B(Star), R(21),
+                B(LdaNamedProperty), R(21), U8(4), U8(1),
                 B(JumpIfUndefined), U8(17),
                 B(JumpIfNull), U8(15),
-                B(Star), R(21),
-                B(CallProperty0), R(21), R(20), U8(3),
+                B(Star), R(22),
+                B(CallProperty0), R(22), R(21), U8(3),
                 B(JumpIfJSReceiver), U8(23),
                 B(CallRuntime), U16(Runtime::kThrowSymbolAsyncIteratorInvalid), R(0), U8(0),
-                B(LdaNamedProperty), R(20), U8(5), U8(5),
-                B(Star), R(21),
-                B(CallProperty0), R(21), R(20), U8(7),
-                B(Star), R(21),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateAsyncFromSyncIterator), R(21), U8(1),
+                B(LdaNamedProperty), R(21), U8(5), U8(5),
+                B(Star), R(22),
+                B(CallProperty0), R(22), R(21), U8(7),
+                B(Star), R(22),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateAsyncFromSyncIterator), R(22), U8(1),
                 B(Star), R(4),
-                B(Ldar), R(11),
-                B(SwitchOnSmiNoFeedback), U8(6), U8(1), I8(0),
+  /*   43 E> */ B(LdaNamedProperty), R(4), U8(6), U8(9),
+                B(Star), R(5),
+                B(Ldar), R(12),
+                B(SwitchOnSmiNoFeedback), U8(7), U8(1), I8(0),
                 B(LdaSmi), I8(-2),
-  /*   43 E> */ B(TestEqualStrictNoFeedback), R(11),
+                B(TestEqualStrictNoFeedback), R(12),
                 B(JumpIfTrue), U8(4),
                 B(Abort), U8(15),
-  /*   40 S> */ B(LdaNamedProperty), R(4), U8(7), U8(9),
-                B(Star), R(20),
-                B(CallProperty0), R(20), R(4), U8(11),
-                B(Star), R(21),
-                B(Mov), R(2), R(20),
-                B(Mov), R(10), R(22),
-                B(CallJSRuntime), U8(%async_function_await_uncaught), R(20), U8(3),
-                B(SuspendGenerator), R(2), R(0), U8(20), U8(0),
+  /*   40 S> */ B(CallProperty0), R(5), R(4), U8(11),
+                B(Star), R(22),
+                B(Mov), R(2), R(21),
+                B(Mov), R(11), R(23),
+                B(CallJSRuntime), U8(%async_function_await_uncaught), R(21), U8(3),
+                B(SuspendGenerator), R(2), R(0), U8(21), U8(0),
   /*  114 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(20),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(21),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(20),
-                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(Star), R(21),
+                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
+                B(Star), R(22),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(21),
+                B(TestEqualStrictNoFeedback), R(22),
                 B(JumpIfTrue), U8(5),
-                B(Ldar), R(20),
+                B(Ldar), R(21),
                 B(ReThrow),
-                B(Mov), R(20), R(5),
-  /*   40 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(20), U8(1),
+                B(Mov), R(21), R(6),
+  /*   40 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(21), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(5), U8(1),
-                B(LdaNamedProperty), R(5), U8(8), U8(13),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
+                B(LdaNamedProperty), R(6), U8(8), U8(13),
                 B(JumpIfToBooleanTrue), U8(43),
-                B(LdaNamedProperty), R(5), U8(9), U8(15),
-                B(Star), R(7),
+                B(LdaNamedProperty), R(6), U8(9), U8(15),
+                B(Star), R(8),
                 B(LdaSmi), I8(2),
-                B(Star), R(6),
-                B(Mov), R(7), R(3),
+                B(Star), R(7),
+                B(Mov), R(8), R(3),
   /*   23 E> */ B(StackCheck),
                 B(Mov), R(3), R(0),
   /*   63 S> */ B(LdaSmi), I8(10),
@@ -684,178 +684,178 @@ bytecodes: [
                 B(JumpIfFalse), U8(4),
   /*  103 S> */ B(Jump), U8(8),
                 B(LdaZero),
-                B(Star), R(6),
-                B(JumpLoop), U8(129), I8(0),
+                B(Star), R(7),
+                B(JumpLoop), U8(123), I8(0),
                 B(Jump), U8(40),
-                B(Star), R(20),
+                B(Star), R(21),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(20), U8(10), U8(11),
-                B(Star), R(19),
+                B(CreateCatchContext), R(21), U8(10), U8(11),
+                B(Star), R(20),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(19),
-                B(PushContext), R(20),
+                B(Ldar), R(20),
+                B(PushContext), R(21),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(6), U8(19),
+                B(TestEqualStrict), R(7), U8(19),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(6),
+                B(Star), R(7),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(21),
-                B(CallRuntime), U16(Runtime::kReThrow), R(21), U8(1),
-                B(PopContext), R(20),
+                B(Star), R(22),
+                B(CallRuntime), U16(Runtime::kReThrow), R(22), U8(1),
+                B(PopContext), R(21),
                 B(LdaSmi), I8(-1),
+                B(Star), R(18),
                 B(Star), R(17),
-                B(Star), R(16),
                 B(Jump), U8(7),
-                B(Star), R(17),
+                B(Star), R(18),
                 B(LdaZero),
-                B(Star), R(16),
+                B(Star), R(17),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(18),
+                B(Star), R(19),
                 B(LdaZero),
-                B(TestEqualStrict), R(6), U8(20),
+                B(TestEqualStrict), R(7), U8(20),
                 B(JumpIfTrue), U8(185),
                 B(LdaNamedProperty), R(4), U8(12), U8(21),
-                B(Star), R(8),
+                B(Star), R(9),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(174),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(6), U8(23),
+                B(TestEqualStrict), R(7), U8(23),
                 B(JumpIfFalse), U8(95),
-                B(Ldar), R(8),
+                B(Ldar), R(9),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(19),
-                B(LdaConstant), U8(13),
                 B(Star), R(20),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(19), U8(2),
-                B(Throw),
-                B(Mov), R(context), R(19),
-                B(Mov), R(8), R(20),
-                B(Mov), R(4), R(21),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(20), U8(2),
+                B(LdaConstant), U8(13),
                 B(Star), R(21),
-                B(Mov), R(2), R(20),
-                B(Mov), R(10), R(22),
-                B(CallJSRuntime), U8(%async_function_await_caught), R(20), U8(3),
-                B(SuspendGenerator), R(2), R(0), U8(20), U8(1),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(20), U8(2),
+                B(Throw),
+                B(Mov), R(context), R(20),
+                B(Mov), R(9), R(21),
+                B(Mov), R(4), R(22),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(21), U8(2),
+                B(Star), R(22),
+                B(Mov), R(2), R(21),
+                B(Mov), R(11), R(23),
+                B(CallJSRuntime), U8(%async_function_await_caught), R(21), U8(3),
+                B(SuspendGenerator), R(2), R(0), U8(21), U8(1),
   /*  114 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(20),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(21),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(20),
-                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(Star), R(21),
+                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
+                B(Star), R(22),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(21),
+                B(TestEqualStrictNoFeedback), R(22),
                 B(JumpIfTrue), U8(5),
-                B(Ldar), R(20),
+                B(Ldar), R(21),
                 B(ReThrow),
-                B(Ldar), R(20),
+                B(Ldar), R(21),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(19),
+                B(Ldar), R(20),
                 B(Jump), U8(74),
-                B(Mov), R(8), R(19),
-                B(Mov), R(4), R(20),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(19), U8(2),
-                B(Star), R(20),
-                B(Mov), R(2), R(19),
-                B(Mov), R(10), R(21),
-                B(CallJSRuntime), U8(%async_function_await_uncaught), R(19), U8(3),
-                B(SuspendGenerator), R(2), R(0), U8(19), U8(2),
+                B(Mov), R(9), R(20),
+                B(Mov), R(4), R(21),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(20), U8(2),
+                B(Star), R(21),
+                B(Mov), R(2), R(20),
+                B(Mov), R(11), R(22),
+                B(CallJSRuntime), U8(%async_function_await_uncaught), R(20), U8(3),
+                B(SuspendGenerator), R(2), R(0), U8(20), U8(2),
   /*  114 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(19),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(20),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(19),
-                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(Star), R(20),
+                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
+                B(Star), R(21),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(20),
+                B(TestEqualStrictNoFeedback), R(21),
                 B(JumpIfTrue), U8(5),
-                B(Ldar), R(19),
+                B(Ldar), R(20),
                 B(ReThrow),
-                B(Mov), R(19), R(9),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(19), U8(1),
+                B(Mov), R(20), R(10),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(20), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1),
-                B(Ldar), R(18),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(10), U8(1),
+                B(Ldar), R(19),
                 B(SetPendingMessage),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(16),
+                B(TestEqualStrictNoFeedback), R(17),
                 B(JumpIfFalse), U8(5),
-                B(Ldar), R(17),
+                B(Ldar), R(18),
                 B(ReThrow),
                 B(LdaUndefined),
-                B(Star), R(17),
-                B(Mov), R(10), R(16),
-                B(CallJSRuntime), U8(%promise_resolve), R(16), U8(2),
+                B(Star), R(18),
+                B(Mov), R(11), R(17),
+                B(CallJSRuntime), U8(%promise_resolve), R(17), U8(2),
                 B(LdaZero),
-                B(Star), R(12),
-                B(Mov), R(10), R(13),
+                B(Star), R(13),
+                B(Mov), R(11), R(14),
                 B(Jump), U8(58),
                 B(Jump), U8(42),
-                B(Star), R(16),
+                B(Star), R(17),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(16), U8(10), U8(14),
-                B(Star), R(15),
+                B(CreateCatchContext), R(17), U8(10), U8(14),
+                B(Star), R(16),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(15),
-                B(PushContext), R(16),
+                B(Ldar), R(16),
+                B(PushContext), R(17),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(18),
-                B(LdaFalse),
                 B(Star), R(19),
-                B(Mov), R(10), R(17),
-                B(CallJSRuntime), U8(%promise_internal_reject), R(17), U8(3),
-                B(PopContext), R(16),
+                B(LdaFalse),
+                B(Star), R(20),
+                B(Mov), R(11), R(18),
+                B(CallJSRuntime), U8(%promise_internal_reject), R(18), U8(3),
+                B(PopContext), R(17),
                 B(LdaZero),
-                B(Star), R(12),
-                B(Mov), R(10), R(13),
+                B(Star), R(13),
+                B(Mov), R(11), R(14),
                 B(Jump), U8(16),
                 B(LdaSmi), I8(-1),
+                B(Star), R(14),
                 B(Star), R(13),
-                B(Star), R(12),
                 B(Jump), U8(8),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(LdaSmi), I8(1),
-                B(Star), R(12),
+                B(Star), R(13),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(14),
-                B(CallJSRuntime), U8(%async_function_promise_release), R(10), U8(1),
-                B(Ldar), R(14),
+                B(Star), R(15),
+                B(CallJSRuntime), U8(%async_function_promise_release), R(11), U8(1),
+                B(Ldar), R(15),
                 B(SetPendingMessage),
-                B(Ldar), R(12),
+                B(Ldar), R(13),
                 B(SwitchOnSmiNoFeedback), U8(15), U8(2), I8(0),
                 B(Jump), U8(8),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
   /*  114 S> */ B(Return),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
                 B(ReThrow),
                 B(LdaUndefined),
   /*  114 S> */ B(Return),
 ]
 constant pool: [
-  Smi [89],
+  Smi [95],
   Smi [357],
   Smi [423],
   TUPLE2_TYPE,
   SYMBOL_TYPE,
   SYMBOL_TYPE,
-  Smi [40],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
+  Smi [34],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE [".catch"],
@@ -882,180 +882,180 @@ snippet: "
   }
   f();
 "
-frame size: 19
+frame size: 20
 parameter count: 1
 bytecode array length: 403
 bytecodes: [
   /*   16 E> */ B(StackCheck),
                 B(CallJSRuntime), U8(%async_function_promise_create), R(0), U8(0),
-                B(Star), R(8),
-                B(Mov), R(context), R(11),
+                B(Star), R(9),
                 B(Mov), R(context), R(12),
-  /*   31 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(41), R(13),
-                B(Mov), R(13), R(1),
+                B(Mov), R(context), R(13),
+  /*   31 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(41), R(14),
+                B(Mov), R(14), R(1),
                 B(LdaZero),
-                B(Star), R(4),
-                B(Mov), R(context), R(15),
+                B(Star), R(5),
                 B(Mov), R(context), R(16),
+                B(Mov), R(context), R(17),
   /*   68 S> */ B(CreateArrayLiteral), U8(1), U8(1), U8(37),
-                B(Star), R(17),
-                B(LdaNamedProperty), R(17), U8(2), U8(2),
                 B(Star), R(18),
-                B(CallProperty0), R(18), R(17), U8(4),
+                B(LdaNamedProperty), R(18), U8(2), U8(2),
+                B(Star), R(19),
+                B(CallProperty0), R(19), R(18), U8(4),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(2),
-  /*   59 S> */ B(LdaNamedProperty), R(2), U8(3), U8(6),
-                B(Star), R(17),
-                B(CallProperty0), R(17), R(2), U8(8),
+  /*   68 E> */ B(LdaNamedProperty), R(2), U8(3), U8(6),
                 B(Star), R(3),
-  /*   59 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(3), U8(1),
+  /*   59 S> */ B(CallProperty0), R(3), R(2), U8(8),
+                B(Star), R(4),
+  /*   59 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(4), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(3), U8(1),
-                B(LdaNamedProperty), R(3), U8(4), U8(10),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(4), U8(1),
+                B(LdaNamedProperty), R(4), U8(4), U8(10),
                 B(JumpIfToBooleanTrue), U8(30),
-  /*   58 E> */ B(LdaNamedProperty), R(3), U8(5), U8(12),
-                B(Star), R(5),
+  /*   58 E> */ B(LdaNamedProperty), R(4), U8(5), U8(12),
+                B(Star), R(6),
                 B(LdaSmi), I8(2),
-                B(Star), R(4),
-                B(Ldar), R(5),
+                B(Star), R(5),
+                B(Ldar), R(6),
                 B(StaNamedProperty), R(1), U8(6), U8(14),
   /*   53 E> */ B(StackCheck),
   /*   87 S> */ B(LdaNamedProperty), R(1), U8(6), U8(16),
-                B(Star), R(14),
+                B(Star), R(15),
                 B(LdaZero),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(Jump), U8(56),
                 B(Jump), U8(40),
-                B(Star), R(17),
+                B(Star), R(18),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(17), U8(7), U8(8),
-                B(Star), R(16),
+                B(CreateCatchContext), R(18), U8(7), U8(8),
+                B(Star), R(17),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(16),
-                B(PushContext), R(17),
+                B(Ldar), R(17),
+                B(PushContext), R(18),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(4), U8(18),
+                B(TestEqualStrict), R(5), U8(18),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(4),
+                B(Star), R(5),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(18),
-                B(CallRuntime), U16(Runtime::kReThrow), R(18), U8(1),
-                B(PopContext), R(17),
+                B(Star), R(19),
+                B(CallRuntime), U16(Runtime::kReThrow), R(19), U8(1),
+                B(PopContext), R(18),
                 B(LdaSmi), I8(-1),
+                B(Star), R(15),
                 B(Star), R(14),
-                B(Star), R(13),
                 B(Jump), U8(8),
-                B(Star), R(14),
+                B(Star), R(15),
                 B(LdaSmi), I8(1),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(15),
+                B(Star), R(16),
                 B(LdaZero),
-                B(TestEqualStrict), R(4), U8(19),
+                B(TestEqualStrict), R(5), U8(19),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(2), U8(9), U8(20),
-                B(Star), R(6),
+                B(Star), R(7),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(4), U8(22),
+                B(TestEqualStrict), R(5), U8(22),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(6),
+                B(Ldar), R(7),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(16),
-                B(LdaConstant), U8(10),
                 B(Star), R(17),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(16), U8(2),
+                B(LdaConstant), U8(10),
+                B(Star), R(18),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(17), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(16),
-                B(Mov), R(6), R(17),
-                B(Mov), R(2), R(18),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(17), U8(2),
+                B(Mov), R(context), R(17),
+                B(Mov), R(7), R(18),
+                B(Mov), R(2), R(19),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(18), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(16),
+                B(Ldar), R(17),
                 B(Jump), U8(27),
-                B(Mov), R(6), R(16),
-                B(Mov), R(2), R(17),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(16), U8(2),
-                B(Star), R(7),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(7), U8(1),
+                B(Mov), R(7), R(17),
+                B(Mov), R(2), R(18),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(17), U8(2),
+                B(Star), R(8),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(8), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(7), U8(1),
-                B(Ldar), R(15),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(8), U8(1),
+                B(Ldar), R(16),
                 B(SetPendingMessage),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
                 B(SwitchOnSmiNoFeedback), U8(11), U8(2), I8(0),
                 B(Jump), U8(13),
                 B(LdaZero),
-                B(Star), R(9),
-                B(Mov), R(14), R(10),
+                B(Star), R(10),
+                B(Mov), R(15), R(11),
                 B(Jump), U8(81),
-                B(Ldar), R(14),
+                B(Ldar), R(15),
                 B(ReThrow),
                 B(LdaUndefined),
-                B(Star), R(14),
-                B(Mov), R(8), R(13),
-                B(CallJSRuntime), U8(%promise_resolve), R(13), U8(2),
+                B(Star), R(15),
+                B(Mov), R(9), R(14),
+                B(CallJSRuntime), U8(%promise_resolve), R(14), U8(2),
                 B(LdaSmi), I8(1),
-                B(Star), R(9),
-                B(Mov), R(8), R(10),
+                B(Star), R(10),
+                B(Mov), R(9), R(11),
                 B(Jump), U8(59),
                 B(Jump), U8(43),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(13), U8(7), U8(13),
-                B(Star), R(12),
+                B(CreateCatchContext), R(14), U8(7), U8(13),
+                B(Star), R(13),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(12),
-                B(PushContext), R(13),
+                B(Ldar), R(13),
+                B(PushContext), R(14),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(15),
-                B(LdaFalse),
                 B(Star), R(16),
-                B(Mov), R(8), R(14),
-                B(CallJSRuntime), U8(%promise_internal_reject), R(14), U8(3),
-                B(PopContext), R(13),
+                B(LdaFalse),
+                B(Star), R(17),
+                B(Mov), R(9), R(15),
+                B(CallJSRuntime), U8(%promise_internal_reject), R(15), U8(3),
+                B(PopContext), R(14),
                 B(LdaSmi), I8(1),
-                B(Star), R(9),
-                B(Mov), R(8), R(10),
+                B(Star), R(10),
+                B(Mov), R(9), R(11),
                 B(Jump), U8(16),
                 B(LdaSmi), I8(-1),
+                B(Star), R(11),
                 B(Star), R(10),
-                B(Star), R(9),
                 B(Jump), U8(8),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(LdaSmi), I8(2),
-                B(Star), R(9),
+                B(Star), R(10),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(11),
-                B(CallJSRuntime), U8(%async_function_promise_release), R(8), U8(1),
-                B(Ldar), R(11),
+                B(Star), R(12),
+                B(CallJSRuntime), U8(%async_function_promise_release), R(9), U8(1),
+                B(Ldar), R(12),
                 B(SetPendingMessage),
-                B(Ldar), R(9),
+                B(Ldar), R(10),
                 B(SwitchOnSmiNoFeedback), U8(14), U8(3), I8(0),
                 B(Jump), U8(21),
-                B(Mov), R(8), R(12),
-                B(Mov), R(10), R(13),
-                B(CallJSRuntime), U8(%promise_resolve), R(12), U8(2),
-                B(Ldar), R(8),
+                B(Mov), R(9), R(13),
+                B(Mov), R(11), R(14),
+                B(CallJSRuntime), U8(%promise_resolve), R(13), U8(2),
+                B(Ldar), R(9),
   /*   96 S> */ B(Return),
-                B(Ldar), R(10),
+                B(Ldar), R(11),
   /*   96 S> */ B(Return),
-                B(Ldar), R(10),
+                B(Ldar), R(11),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   96 S> */ B(Return),

test/cctest/interpreter/bytecode_expectations/ForOf.golden

@@ -9,112 +9,112 @@ wrap: yes
 snippet: "
   for (var p of [0, 1, 2]) {}
 "
-frame size: 14
+frame size: 15
 parameter count: 1
 bytecode array length: 248
 bytecodes: [
   /*   30 E> */ B(StackCheck),
                 B(LdaZero),
-                B(Star), R(4),
-                B(Mov), R(context), R(10),
+                B(Star), R(5),
                 B(Mov), R(context), R(11),
+                B(Mov), R(context), R(12),
   /*   48 S> */ B(CreateArrayLiteral), U8(0), U8(0), U8(37),
-                B(Star), R(12),
-                B(LdaNamedProperty), R(12), U8(1), U8(1),
                 B(Star), R(13),
-                B(CallProperty0), R(13), R(12), U8(3),
+                B(LdaNamedProperty), R(13), U8(1), U8(1),
+                B(Star), R(14),
+                B(CallProperty0), R(14), R(13), U8(3),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(2),
-  /*   43 S> */ B(LdaNamedProperty), R(2), U8(2), U8(5),
-                B(Star), R(12),
-                B(CallProperty0), R(12), R(2), U8(7),
+  /*   48 E> */ B(LdaNamedProperty), R(2), U8(2), U8(5),
                 B(Star), R(3),
-  /*   43 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(3), U8(1),
+  /*   43 S> */ B(CallProperty0), R(3), R(2), U8(7),
+                B(Star), R(4),
+  /*   43 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(4), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(3), U8(1),
-                B(LdaNamedProperty), R(3), U8(3), U8(9),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(4), U8(1),
+                B(LdaNamedProperty), R(4), U8(3), U8(9),
                 B(JumpIfToBooleanTrue), U8(25),
-                B(LdaNamedProperty), R(3), U8(4), U8(11),
-                B(Star), R(5),
+                B(LdaNamedProperty), R(4), U8(4), U8(11),
+                B(Star), R(6),
                 B(LdaSmi), I8(2),
-                B(Star), R(4),
-                B(Mov), R(5), R(0),
+                B(Star), R(5),
+                B(Mov), R(6), R(0),
   /*   34 E> */ B(StackCheck),
                 B(Mov), R(0), R(1),
                 B(LdaZero),
-                B(Star), R(4),
-                B(JumpLoop), U8(50), I8(0),
+                B(Star), R(5),
+                B(JumpLoop), U8(44), I8(0),
                 B(Jump), U8(36),
-                B(Star), R(12),
+                B(Star), R(13),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(12), U8(5), U8(6),
-                B(PushContext), R(12),
-                B(Star), R(11),
+                B(CreateCatchContext), R(13), U8(5), U8(6),
+                B(PushContext), R(13),
+                B(Star), R(12),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(4), U8(13),
+                B(TestEqualStrict), R(5), U8(13),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(4),
+                B(Star), R(5),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(13),
-                B(CallRuntime), U16(Runtime::kReThrow), R(13), U8(1),
-                B(PopContext), R(12),
+                B(Star), R(14),
+                B(CallRuntime), U16(Runtime::kReThrow), R(14), U8(1),
+                B(PopContext), R(13),
                 B(LdaSmi), I8(-1),
+                B(Star), R(10),
                 B(Star), R(9),
-                B(Star), R(8),
                 B(Jump), U8(7),
-                B(Star), R(9),
+                B(Star), R(10),
                 B(LdaZero),
-                B(Star), R(8),
+                B(Star), R(9),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(LdaZero),
-                B(TestEqualStrict), R(4), U8(14),
+                B(TestEqualStrict), R(5), U8(14),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(2), U8(7), U8(15),
-                B(Star), R(6),
+                B(Star), R(7),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(4), U8(17),
+                B(TestEqualStrict), R(5), U8(17),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(6),
+                B(Ldar), R(7),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(11),
-                B(LdaConstant), U8(8),
                 B(Star), R(12),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(11), U8(2),
+                B(LdaConstant), U8(8),
+                B(Star), R(13),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(12), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(11),
-                B(Mov), R(6), R(12),
-                B(Mov), R(2), R(13),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(12), U8(2),
+                B(Mov), R(context), R(12),
+                B(Mov), R(7), R(13),
+                B(Mov), R(2), R(14),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(13), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(11),
+                B(Ldar), R(12),
                 B(Jump), U8(27),
-                B(Mov), R(6), R(11),
-                B(Mov), R(2), R(12),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(11), U8(2),
-                B(Star), R(7),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(7), U8(1),
+                B(Mov), R(7), R(12),
+                B(Mov), R(2), R(13),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(12), U8(2),
+                B(Star), R(8),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(8), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(7), U8(1),
-                B(Ldar), R(10),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(8), U8(1),
+                B(Ldar), R(11),
                 B(SetPendingMessage),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(8),
+                B(TestEqualStrictNoFeedback), R(9),
                 B(JumpIfFalse), U8(5),
-                B(Ldar), R(9),
+                B(Ldar), R(10),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   62 S> */ B(Return),
@@ -141,7 +141,7 @@ snippet: "
   var x = 'potatoes';
   for (var p of x) { return p; }
 "
-frame size: 15
+frame size: 16
 parameter count: 1
 bytecode array length: 258
 bytecodes: [
@@ -149,108 +149,108 @@ bytecodes: [
   /*   42 S> */ B(LdaConstant), U8(0),
                 B(Star), R(0),
                 B(LdaZero),
-                B(Star), R(5),
-                B(Mov), R(context), R(11),
+                B(Star), R(6),
                 B(Mov), R(context), R(12),
+                B(Mov), R(context), R(13),
   /*   68 S> */ B(LdaNamedProperty), R(0), U8(1), U8(0),
-                B(Star), R(14),
-                B(CallProperty0), R(14), R(0), U8(2),
-                B(Mov), R(0), R(13),
+                B(Star), R(15),
+                B(CallProperty0), R(15), R(0), U8(2),
+                B(Mov), R(0), R(14),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(3),
-  /*   63 S> */ B(LdaNamedProperty), R(3), U8(2), U8(4),
-                B(Star), R(13),
-                B(CallProperty0), R(13), R(3), U8(6),
+  /*   68 E> */ B(LdaNamedProperty), R(3), U8(2), U8(4),
                 B(Star), R(4),
-  /*   63 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(4), U8(1),
+  /*   63 S> */ B(CallProperty0), R(4), R(3), U8(6),
+                B(Star), R(5),
+  /*   63 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(5), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(4), U8(1),
-                B(LdaNamedProperty), R(4), U8(3), U8(8),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(5), U8(1),
+                B(LdaNamedProperty), R(5), U8(3), U8(8),
                 B(JumpIfToBooleanTrue), U8(27),
-                B(LdaNamedProperty), R(4), U8(4), U8(10),
-                B(Star), R(6),
+                B(LdaNamedProperty), R(5), U8(4), U8(10),
+                B(Star), R(7),
                 B(LdaSmi), I8(2),
-                B(Star), R(5),
-                B(Mov), R(6), R(1),
+                B(Star), R(6),
+                B(Mov), R(7), R(1),
   /*   54 E> */ B(StackCheck),
                 B(Mov), R(1), R(2),
   /*   73 S> */ B(LdaZero),
-                B(Star), R(9),
-                B(Mov), R(6), R(10),
+                B(Star), R(10),
+                B(Mov), R(7), R(11),
                 B(Jump), U8(52),
                 B(Jump), U8(36),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(13), U8(5), U8(6),
-                B(PushContext), R(13),
-                B(Star), R(12),
+                B(CreateCatchContext), R(14), U8(5), U8(6),
+                B(PushContext), R(14),
+                B(Star), R(13),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(5), U8(12),
+                B(TestEqualStrict), R(6), U8(12),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(5),
+                B(Star), R(6),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(14),
-                B(CallRuntime), U16(Runtime::kReThrow), R(14), U8(1),
-                B(PopContext), R(13),
+                B(Star), R(15),
+                B(CallRuntime), U16(Runtime::kReThrow), R(15), U8(1),
+                B(PopContext), R(14),
                 B(LdaSmi), I8(-1),
+                B(Star), R(11),
                 B(Star), R(10),
-                B(Star), R(9),
                 B(Jump), U8(8),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(LdaSmi), I8(1),
-                B(Star), R(9),
+                B(Star), R(10),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(LdaZero),
-                B(TestEqualStrict), R(5), U8(13),
+                B(TestEqualStrict), R(6), U8(13),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(3), U8(7), U8(14),
-                B(Star), R(7),
+                B(Star), R(8),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(5), U8(16),
+                B(TestEqualStrict), R(6), U8(16),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(7),
+                B(Ldar), R(8),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(12),
-                B(LdaConstant), U8(8),
                 B(Star), R(13),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(12), U8(2),
+                B(LdaConstant), U8(8),
+                B(Star), R(14),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(13), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(12),
-                B(Mov), R(7), R(13),
-                B(Mov), R(3), R(14),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(13), U8(2),
+                B(Mov), R(context), R(13),
+                B(Mov), R(8), R(14),
+                B(Mov), R(3), R(15),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(14), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(12),
+                B(Ldar), R(13),
                 B(Jump), U8(27),
-                B(Mov), R(7), R(12),
-                B(Mov), R(3), R(13),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(12), U8(2),
-                B(Star), R(8),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(8), U8(1),
+                B(Mov), R(8), R(13),
+                B(Mov), R(3), R(14),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(13), U8(2),
+                B(Star), R(9),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(9), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(8), U8(1),
-                B(Ldar), R(11),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1),
+                B(Ldar), R(12),
                 B(SetPendingMessage),
-                B(Ldar), R(9),
+                B(Ldar), R(10),
                 B(SwitchOnSmiNoFeedback), U8(9), U8(2), I8(0),
                 B(Jump), U8(8),
-                B(Ldar), R(10),
+                B(Ldar), R(11),
   /*   85 S> */ B(Return),
-                B(Ldar), R(10),
+                B(Ldar), R(11),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   85 S> */ B(Return),
@@ -281,38 +281,38 @@ snippet: "
     if (x == 20) break;
   }
 "
-frame size: 14
+frame size: 15
 parameter count: 1
 bytecode array length: 266
 bytecodes: [
   /*   30 E> */ B(StackCheck),
                 B(LdaZero),
-                B(Star), R(4),
-                B(Mov), R(context), R(10),
+                B(Star), R(5),
                 B(Mov), R(context), R(11),
+                B(Mov), R(context), R(12),
   /*   48 S> */ B(CreateArrayLiteral), U8(0), U8(0), U8(37),
-                B(Star), R(12),
-                B(LdaNamedProperty), R(12), U8(1), U8(1),
                 B(Star), R(13),
-                B(CallProperty0), R(13), R(12), U8(3),
+                B(LdaNamedProperty), R(13), U8(1), U8(1),
+                B(Star), R(14),
+                B(CallProperty0), R(14), R(13), U8(3),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(2),
-  /*   43 S> */ B(LdaNamedProperty), R(2), U8(2), U8(5),
-                B(Star), R(12),
-                B(CallProperty0), R(12), R(2), U8(7),
+  /*   48 E> */ B(LdaNamedProperty), R(2), U8(2), U8(5),
                 B(Star), R(3),
-  /*   43 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(3), U8(1),
+  /*   43 S> */ B(CallProperty0), R(3), R(2), U8(7),
+                B(Star), R(4),
+  /*   43 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(4), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(3), U8(1),
-                B(LdaNamedProperty), R(3), U8(3), U8(9),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(4), U8(1),
+                B(LdaNamedProperty), R(4), U8(3), U8(9),
                 B(JumpIfToBooleanTrue), U8(43),
-                B(LdaNamedProperty), R(3), U8(4), U8(11),
-                B(Star), R(5),
+                B(LdaNamedProperty), R(4), U8(4), U8(11),
+                B(Star), R(6),
                 B(LdaSmi), I8(2),
-                B(Star), R(4),
-                B(Mov), R(5), R(0),
+                B(Star), R(5),
+                B(Mov), R(6), R(0),
   /*   34 E> */ B(StackCheck),
                 B(Mov), R(0), R(1),
   /*   66 S> */ B(LdaSmi), I8(10),
@@ -324,77 +324,77 @@ bytecodes: [
                 B(JumpIfFalse), U8(4),
   /*  104 S> */ B(Jump), U8(8),
                 B(LdaZero),
-                B(Star), R(4),
-                B(JumpLoop), U8(68), I8(0),
+                B(Star), R(5),
+                B(JumpLoop), U8(62), I8(0),
                 B(Jump), U8(36),
-                B(Star), R(12),
+                B(Star), R(13),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(12), U8(5), U8(6),
-                B(PushContext), R(12),
-                B(Star), R(11),
+                B(CreateCatchContext), R(13), U8(5), U8(6),
+                B(PushContext), R(13),
+                B(Star), R(12),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(4), U8(15),
+                B(TestEqualStrict), R(5), U8(15),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(4),
+                B(Star), R(5),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(13),
-                B(CallRuntime), U16(Runtime::kReThrow), R(13), U8(1),
-                B(PopContext), R(12),
+                B(Star), R(14),
+                B(CallRuntime), U16(Runtime::kReThrow), R(14), U8(1),
+                B(PopContext), R(13),
                 B(LdaSmi), I8(-1),
+                B(Star), R(10),
                 B(Star), R(9),
-                B(Star), R(8),
                 B(Jump), U8(7),
-                B(Star), R(9),
+                B(Star), R(10),
                 B(LdaZero),
-                B(Star), R(8),
+                B(Star), R(9),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(LdaZero),
-                B(TestEqualStrict), R(4), U8(16),
+                B(TestEqualStrict), R(5), U8(16),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(2), U8(7), U8(17),
-                B(Star), R(6),
+                B(Star), R(7),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(4), U8(19),
+                B(TestEqualStrict), R(5), U8(19),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(6),
+                B(Ldar), R(7),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(11),
-                B(LdaConstant), U8(8),
                 B(Star), R(12),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(11), U8(2),
+                B(LdaConstant), U8(8),
+                B(Star), R(13),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(12), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(11),
-                B(Mov), R(6), R(12),
-                B(Mov), R(2), R(13),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(12), U8(2),
+                B(Mov), R(context), R(12),
+                B(Mov), R(7), R(13),
+                B(Mov), R(2), R(14),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(13), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(11),
+                B(Ldar), R(12),
                 B(Jump), U8(27),
-                B(Mov), R(6), R(11),
-                B(Mov), R(2), R(12),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(11), U8(2),
-                B(Star), R(7),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(7), U8(1),
+                B(Mov), R(7), R(12),
+                B(Mov), R(2), R(13),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(12), U8(2),
+                B(Star), R(8),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(8), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(7), U8(1),
-                B(Ldar), R(10),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(8), U8(1),
+                B(Ldar), R(11),
                 B(SetPendingMessage),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(8),
+                B(TestEqualStrictNoFeedback), R(9),
                 B(JumpIfFalse), U8(5),
-                B(Ldar), R(9),
+                B(Ldar), R(10),
                 B(ReThrow),
                 B(LdaUndefined),
   /*  113 S> */ B(Return),
@@ -421,118 +421,118 @@ snippet: "
   var x = { 'a': 1, 'b': 2 };
   for (x['a'] of [1,2,3]) { return x['a']; }
 "
-frame size: 13
+frame size: 14
 parameter count: 1
 bytecode array length: 268
 bytecodes: [
   /*   30 E> */ B(StackCheck),
-  /*   42 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(41), R(7),
-                B(Mov), R(7), R(0),
+  /*   42 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(41), R(8),
+                B(Mov), R(8), R(0),
                 B(LdaZero),
-                B(Star), R(3),
-                B(Mov), R(context), R(9),
+                B(Star), R(4),
                 B(Mov), R(context), R(10),
+                B(Mov), R(context), R(11),
   /*   77 S> */ B(CreateArrayLiteral), U8(1), U8(1), U8(37),
-                B(Star), R(11),
-                B(LdaNamedProperty), R(11), U8(2), U8(2),
                 B(Star), R(12),
-                B(CallProperty0), R(12), R(11), U8(4),
+                B(LdaNamedProperty), R(12), U8(2), U8(2),
+                B(Star), R(13),
+                B(CallProperty0), R(13), R(12), U8(4),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(1),
-  /*   68 S> */ B(LdaNamedProperty), R(1), U8(3), U8(6),
-                B(Star), R(11),
-                B(CallProperty0), R(11), R(1), U8(8),
+  /*   77 E> */ B(LdaNamedProperty), R(1), U8(3), U8(6),
                 B(Star), R(2),
-  /*   68 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(2), U8(1),
+  /*   68 S> */ B(CallProperty0), R(2), R(1), U8(8),
+                B(Star), R(3),
+  /*   68 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(3), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(2), U8(1),
-                B(LdaNamedProperty), R(2), U8(4), U8(10),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(3), U8(1),
+                B(LdaNamedProperty), R(3), U8(4), U8(10),
                 B(JumpIfToBooleanTrue), U8(30),
-  /*   67 E> */ B(LdaNamedProperty), R(2), U8(5), U8(12),
-                B(Star), R(4),
+  /*   67 E> */ B(LdaNamedProperty), R(3), U8(5), U8(12),
+                B(Star), R(5),
                 B(LdaSmi), I8(2),
-                B(Star), R(3),
-                B(Ldar), R(4),
+                B(Star), R(4),
+                B(Ldar), R(5),
                 B(StaNamedProperty), R(0), U8(6), U8(14),
   /*   62 E> */ B(StackCheck),
   /*   96 S> */ B(LdaNamedProperty), R(0), U8(6), U8(16),
-                B(Star), R(8),
+                B(Star), R(9),
                 B(LdaZero),
-                B(Star), R(7),
+                B(Star), R(8),
                 B(Jump), U8(52),
                 B(Jump), U8(36),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(11), U8(7), U8(8),
-                B(PushContext), R(11),
-                B(Star), R(10),
+                B(CreateCatchContext), R(12), U8(7), U8(8),
+                B(PushContext), R(12),
+                B(Star), R(11),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(3), U8(18),
+                B(TestEqualStrict), R(4), U8(18),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(3),
+                B(Star), R(4),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(12),
-                B(CallRuntime), U16(Runtime::kReThrow), R(12), U8(1),
-                B(PopContext), R(11),
+                B(Star), R(13),
+                B(CallRuntime), U16(Runtime::kReThrow), R(13), U8(1),
+                B(PopContext), R(12),
                 B(LdaSmi), I8(-1),
+                B(Star), R(9),
                 B(Star), R(8),
-                B(Star), R(7),
                 B(Jump), U8(8),
-                B(Star), R(8),
+                B(Star), R(9),
                 B(LdaSmi), I8(1),
-                B(Star), R(7),
+                B(Star), R(8),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(9),
+                B(Star), R(10),
                 B(LdaZero),
-                B(TestEqualStrict), R(3), U8(19),
+                B(TestEqualStrict), R(4), U8(19),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(1), U8(9), U8(20),
-                B(Star), R(5),
+                B(Star), R(6),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(3), U8(22),
+                B(TestEqualStrict), R(4), U8(22),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(5),
+                B(Ldar), R(6),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(10),
-                B(LdaConstant), U8(10),
                 B(Star), R(11),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(10), U8(2),
+                B(LdaConstant), U8(10),
+                B(Star), R(12),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(11), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(10),
-                B(Mov), R(5), R(11),
-                B(Mov), R(1), R(12),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(11), U8(2),
+                B(Mov), R(context), R(11),
+                B(Mov), R(6), R(12),
+                B(Mov), R(1), R(13),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(12), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(10),
+                B(Ldar), R(11),
                 B(Jump), U8(27),
-                B(Mov), R(5), R(10),
-                B(Mov), R(1), R(11),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(10), U8(2),
-                B(Star), R(6),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(6), U8(1),
+                B(Mov), R(6), R(11),
+                B(Mov), R(1), R(12),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(11), U8(2),
+                B(Star), R(7),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(7), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
-                B(Ldar), R(9),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(7), U8(1),
+                B(Ldar), R(10),
                 B(SetPendingMessage),
-                B(Ldar), R(7),
+                B(Ldar), R(8),
                 B(SwitchOnSmiNoFeedback), U8(11), U8(2), I8(0),
                 B(Jump), U8(8),
-                B(Ldar), R(8),
+                B(Ldar), R(9),
   /*  105 S> */ B(Return),
-                B(Ldar), R(8),
+                B(Ldar), R(9),
                 B(ReThrow),
                 B(LdaUndefined),
   /*  105 S> */ B(Return),

test/cctest/interpreter/bytecode_expectations/ForOfLoop.golden

@@ -13,112 +13,112 @@ snippet: "
   }
   f([1, 2, 3]);
 "
-frame size: 16
+frame size: 17
 parameter count: 2
 bytecode array length: 248
 bytecodes: [
   /*   10 E> */ B(StackCheck),
                 B(LdaZero),
-                B(Star), R(6),
-                B(Mov), R(context), R(12),
+                B(Star), R(7),
                 B(Mov), R(context), R(13),
+                B(Mov), R(context), R(14),
   /*   34 S> */ B(LdaNamedProperty), R(arg0), U8(0), U8(0),
-                B(Star), R(15),
-                B(CallProperty0), R(15), R(arg0), U8(2),
-                B(Mov), R(arg0), R(14),
+                B(Star), R(16),
+                B(CallProperty0), R(16), R(arg0), U8(2),
+                B(Mov), R(arg0), R(15),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(4),
-  /*   29 S> */ B(LdaNamedProperty), R(4), U8(1), U8(4),
-                B(Star), R(14),
-                B(CallProperty0), R(14), R(4), U8(6),
+  /*   34 E> */ B(LdaNamedProperty), R(4), U8(1), U8(4),
                 B(Star), R(5),
-  /*   29 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(5), U8(1),
+  /*   29 S> */ B(CallProperty0), R(5), R(4), U8(6),
+                B(Star), R(6),
+  /*   29 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(6), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(5), U8(1),
-                B(LdaNamedProperty), R(5), U8(2), U8(8),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
+                B(LdaNamedProperty), R(6), U8(2), U8(8),
                 B(JumpIfToBooleanTrue), U8(28),
-                B(LdaNamedProperty), R(5), U8(3), U8(10),
-                B(Star), R(7),
+                B(LdaNamedProperty), R(6), U8(3), U8(10),
+                B(Star), R(8),
                 B(LdaSmi), I8(2),
-                B(Star), R(6),
-                B(Mov), R(7), R(3),
+                B(Star), R(7),
+                B(Mov), R(8), R(3),
   /*   20 E> */ B(StackCheck),
                 B(Mov), R(3), R(1),
   /*   49 S> */ B(Mov), R(1), R(0),
                 B(LdaZero),
-                B(Star), R(6),
-                B(JumpLoop), U8(53), I8(0),
+                B(Star), R(7),
+                B(JumpLoop), U8(47), I8(0),
                 B(Jump), U8(36),
-                B(Star), R(14),
+                B(Star), R(15),
                 B(Ldar), R(closure),
-  /*   49 E> */ B(CreateCatchContext), R(14), U8(4), U8(5),
-                B(PushContext), R(14),
-                B(Star), R(13),
+  /*   49 E> */ B(CreateCatchContext), R(15), U8(4), U8(5),
+                B(PushContext), R(15),
+                B(Star), R(14),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(6), U8(12),
+                B(TestEqualStrict), R(7), U8(12),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(6),
+                B(Star), R(7),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(15),
-                B(CallRuntime), U16(Runtime::kReThrow), R(15), U8(1),
-                B(PopContext), R(14),
+                B(Star), R(16),
+                B(CallRuntime), U16(Runtime::kReThrow), R(16), U8(1),
+                B(PopContext), R(15),
                 B(LdaSmi), I8(-1),
+                B(Star), R(12),
                 B(Star), R(11),
-                B(Star), R(10),
                 B(Jump), U8(7),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(LdaZero),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(12),
+                B(Star), R(13),
                 B(LdaZero),
-                B(TestEqualStrict), R(6), U8(13),
+                B(TestEqualStrict), R(7), U8(13),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(4), U8(6), U8(14),
-                B(Star), R(8),
+                B(Star), R(9),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(6), U8(16),
+                B(TestEqualStrict), R(7), U8(16),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(8),
+                B(Ldar), R(9),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(13),
-                B(LdaConstant), U8(7),
                 B(Star), R(14),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(13), U8(2),
+                B(LdaConstant), U8(7),
+                B(Star), R(15),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(14), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(13),
-                B(Mov), R(8), R(14),
-                B(Mov), R(4), R(15),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(14), U8(2),
+                B(Mov), R(context), R(14),
+                B(Mov), R(9), R(15),
+                B(Mov), R(4), R(16),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(15), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
                 B(Jump), U8(27),
-                B(Mov), R(8), R(13),
-                B(Mov), R(4), R(14),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(13), U8(2),
-                B(Star), R(9),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(9), U8(1),
+                B(Mov), R(9), R(14),
+                B(Mov), R(4), R(15),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(14), U8(2),
+                B(Star), R(10),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(10), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1),
-                B(Ldar), R(12),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(10), U8(1),
+                B(Ldar), R(13),
                 B(SetPendingMessage),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(10),
+                B(TestEqualStrictNoFeedback), R(11),
                 B(JumpIfFalse), U8(5),
-                B(Ldar), R(11),
+                B(Ldar), R(12),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   54 S> */ B(Return),
@@ -146,152 +146,152 @@ snippet: "
   }
   f([1, 2, 3]);
 "
-frame size: 23
+frame size: 24
 parameter count: 2
 bytecode array length: 331
 bytecodes: [
                 B(CreateFunctionContext), U8(4),
-                B(PushContext), R(8),
+                B(PushContext), R(9),
                 B(Ldar), R(this),
                 B(StaCurrentContextSlot), U8(5),
                 B(Ldar), R(arg0),
                 B(StaCurrentContextSlot), U8(4),
                 B(CreateMappedArguments),
                 B(StaCurrentContextSlot), U8(7),
-                B(Ldar), R(7),
+                B(Ldar), R(8),
                 B(StaCurrentContextSlot), U8(6),
   /*   10 E> */ B(StackCheck),
                 B(Ldar), R(closure),
                 B(CreateBlockContext), U8(0),
-                B(PushContext), R(9),
+                B(PushContext), R(10),
                 B(LdaTheHole),
                 B(StaCurrentContextSlot), U8(4),
                 B(LdaZero),
-                B(Star), R(3),
-                B(Mov), R(context), R(12),
+                B(Star), R(4),
                 B(Mov), R(context), R(13),
-  /*   34 S> */ B(LdaContextSlot), R(9), U8(4), U8(0),
-                B(Star), R(14),
-                B(LdaNamedProperty), R(14), U8(1), U8(0),
+                B(Mov), R(context), R(14),
+  /*   34 S> */ B(LdaContextSlot), R(10), U8(4), U8(0),
                 B(Star), R(15),
-                B(CallProperty0), R(15), R(14), U8(2),
+                B(LdaNamedProperty), R(15), U8(1), U8(0),
+                B(Star), R(16),
+                B(CallProperty0), R(16), R(15), U8(2),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(1),
-  /*   29 S> */ B(LdaNamedProperty), R(1), U8(2), U8(4),
-                B(Star), R(14),
-                B(CallProperty0), R(14), R(1), U8(6),
+  /*   34 E> */ B(LdaNamedProperty), R(1), U8(2), U8(4),
                 B(Star), R(2),
-  /*   29 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(2), U8(1),
+  /*   29 S> */ B(CallProperty0), R(2), R(1), U8(6),
+                B(Star), R(3),
+  /*   29 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(3), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(2), U8(1),
-                B(LdaNamedProperty), R(2), U8(3), U8(8),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(3), U8(1),
+                B(LdaNamedProperty), R(3), U8(3), U8(8),
                 B(JumpIfToBooleanTrue), U8(78),
-                B(LdaNamedProperty), R(2), U8(4), U8(10),
-                B(Star), R(4),
+                B(LdaNamedProperty), R(3), U8(4), U8(10),
+                B(Star), R(5),
                 B(LdaSmi), I8(2),
-                B(Star), R(3),
-                B(Mov), R(4), R(0),
+                B(Star), R(4),
+                B(Mov), R(5), R(0),
   /*   20 E> */ B(StackCheck),
                 B(Ldar), R(closure),
                 B(CreateBlockContext), U8(5),
-                B(PushContext), R(14),
+                B(PushContext), R(15),
                 B(LdaTheHole),
                 B(StaCurrentContextSlot), U8(4),
-                B(Ldar), R(4),
+                B(Ldar), R(5),
                 B(StaCurrentContextSlot), U8(4),
   /*   41 S> */ B(LdaLookupGlobalSlot), U8(6), U8(12), U8(3),
-                B(Star), R(15),
-                B(LdaConstant), U8(7),
                 B(Star), R(16),
+                B(LdaConstant), U8(7),
+                B(Star), R(17),
                 B(LdaZero),
-                B(Star), R(20),
-                B(LdaSmi), I8(37),
                 B(Star), R(21),
-                B(LdaSmi), I8(41),
+                B(LdaSmi), I8(37),
                 B(Star), R(22),
-                B(Mov), R(15), R(17),
+                B(LdaSmi), I8(41),
+                B(Star), R(23),
                 B(Mov), R(16), R(18),
-                B(Mov), R(closure), R(19),
-                B(CallRuntime), U16(Runtime::kResolvePossiblyDirectEval), R(17), U8(6),
-                B(Star), R(15),
-  /*   41 E> */ B(CallUndefinedReceiver1), R(15), R(16), U8(14),
-                B(PopContext), R(14),
+                B(Mov), R(17), R(19),
+                B(Mov), R(closure), R(20),
+                B(CallRuntime), U16(Runtime::kResolvePossiblyDirectEval), R(18), U8(6),
+                B(Star), R(16),
+  /*   41 E> */ B(CallUndefinedReceiver1), R(16), R(17), U8(14),
+                B(PopContext), R(15),
                 B(LdaZero),
-                B(Star), R(3),
-                B(JumpLoop), U8(103), I8(0),
+                B(Star), R(4),
+                B(JumpLoop), U8(97), I8(0),
                 B(Jump), U8(36),
-                B(Star), R(14),
+                B(Star), R(15),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(14), U8(8), U8(9),
-                B(PushContext), R(14),
-                B(Star), R(13),
+                B(CreateCatchContext), R(15), U8(8), U8(9),
+                B(PushContext), R(15),
+                B(Star), R(14),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(3), U8(16),
+                B(TestEqualStrict), R(4), U8(16),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(3),
+                B(Star), R(4),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(15),
-                B(CallRuntime), U16(Runtime::kReThrow), R(15), U8(1),
-                B(PopContext), R(14),
+                B(Star), R(16),
+                B(CallRuntime), U16(Runtime::kReThrow), R(16), U8(1),
+                B(PopContext), R(15),
                 B(LdaSmi), I8(-1),
+                B(Star), R(12),
                 B(Star), R(11),
-                B(Star), R(10),
                 B(Jump), U8(7),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(LdaZero),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(12),
+                B(Star), R(13),
                 B(LdaZero),
-                B(TestEqualStrict), R(3), U8(17),
+                B(TestEqualStrict), R(4), U8(17),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(1), U8(10), U8(18),
-                B(Star), R(5),
+                B(Star), R(6),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(3), U8(20),
+                B(TestEqualStrict), R(4), U8(20),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(5),
+                B(Ldar), R(6),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(13),
-                B(LdaConstant), U8(11),
                 B(Star), R(14),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(13), U8(2),
+                B(LdaConstant), U8(11),
+                B(Star), R(15),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(14), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(13),
-                B(Mov), R(5), R(14),
-                B(Mov), R(1), R(15),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(14), U8(2),
+                B(Mov), R(context), R(14),
+                B(Mov), R(6), R(15),
+                B(Mov), R(1), R(16),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(15), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
                 B(Jump), U8(27),
-                B(Mov), R(5), R(13),
-                B(Mov), R(1), R(14),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(13), U8(2),
-                B(Star), R(6),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(6), U8(1),
+                B(Mov), R(6), R(14),
+                B(Mov), R(1), R(15),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(14), U8(2),
+                B(Star), R(7),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(7), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
-                B(Ldar), R(12),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(7), U8(1),
+                B(Ldar), R(13),
                 B(SetPendingMessage),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(10),
+                B(TestEqualStrictNoFeedback), R(11),
                 B(JumpIfFalse), U8(5),
-                B(Ldar), R(11),
+                B(Ldar), R(12),
                 B(ReThrow),
-                B(PopContext), R(9),
+                B(PopContext), R(10),
                 B(LdaUndefined),
   /*   54 S> */ B(Return),
 ]
@@ -322,121 +322,121 @@ snippet: "
   }
   f([1, 2, 3]);
 "
-frame size: 14
+frame size: 15
 parameter count: 2
 bytecode array length: 266
 bytecodes: [
   /*   10 E> */ B(StackCheck),
                 B(LdaZero),
-                B(Star), R(4),
-                B(Mov), R(context), R(10),
+                B(Star), R(5),
                 B(Mov), R(context), R(11),
+                B(Mov), R(context), R(12),
   /*   34 S> */ B(LdaNamedProperty), R(arg0), U8(0), U8(0),
-                B(Star), R(13),
-                B(CallProperty0), R(13), R(arg0), U8(2),
-                B(Mov), R(arg0), R(12),
+                B(Star), R(14),
+                B(CallProperty0), R(14), R(arg0), U8(2),
+                B(Mov), R(arg0), R(13),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(2),
-  /*   29 S> */ B(LdaNamedProperty), R(2), U8(1), U8(4),
-                B(Star), R(12),
-                B(CallProperty0), R(12), R(2), U8(6),
+  /*   34 E> */ B(LdaNamedProperty), R(2), U8(1), U8(4),
                 B(Star), R(3),
-  /*   29 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(3), U8(1),
+  /*   29 S> */ B(CallProperty0), R(3), R(2), U8(6),
+                B(Star), R(4),
+  /*   29 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(4), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(3), U8(1),
-                B(LdaNamedProperty), R(3), U8(2), U8(8),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(4), U8(1),
+                B(LdaNamedProperty), R(4), U8(2), U8(8),
                 B(JumpIfToBooleanTrue), U8(46),
-                B(LdaNamedProperty), R(3), U8(3), U8(10),
-                B(Star), R(5),
+                B(LdaNamedProperty), R(4), U8(3), U8(10),
+                B(Star), R(6),
                 B(LdaSmi), I8(2),
-                B(Star), R(4),
-                B(Mov), R(5), R(1),
+                B(Star), R(5),
+                B(Mov), R(6), R(1),
   /*   20 E> */ B(StackCheck),
                 B(Ldar), R(closure),
                 B(CreateBlockContext), U8(4),
-                B(PushContext), R(12),
+                B(PushContext), R(13),
                 B(LdaTheHole),
                 B(StaCurrentContextSlot), U8(4),
-                B(Ldar), R(5),
+                B(Ldar), R(6),
                 B(StaCurrentContextSlot), U8(4),
   /*   41 S> */ B(CreateClosure), U8(5), U8(12), U8(2),
-                B(Star), R(13),
-  /*   67 E> */ B(CallUndefinedReceiver0), R(13), U8(13),
-                B(PopContext), R(12),
+                B(Star), R(14),
+  /*   67 E> */ B(CallUndefinedReceiver0), R(14), U8(13),
+                B(PopContext), R(13),
                 B(LdaZero),
-                B(Star), R(4),
-                B(JumpLoop), U8(71), I8(0),
+                B(Star), R(5),
+                B(JumpLoop), U8(65), I8(0),
                 B(Jump), U8(36),
-                B(Star), R(12),
+                B(Star), R(13),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(12), U8(6), U8(7),
-                B(PushContext), R(12),
-                B(Star), R(11),
+                B(CreateCatchContext), R(13), U8(6), U8(7),
+                B(PushContext), R(13),
+                B(Star), R(12),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(4), U8(15),
+                B(TestEqualStrict), R(5), U8(15),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(4),
+                B(Star), R(5),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(13),
-                B(CallRuntime), U16(Runtime::kReThrow), R(13), U8(1),
-                B(PopContext), R(12),
+                B(Star), R(14),
+                B(CallRuntime), U16(Runtime::kReThrow), R(14), U8(1),
+                B(PopContext), R(13),
                 B(LdaSmi), I8(-1),
+                B(Star), R(10),
                 B(Star), R(9),
-                B(Star), R(8),
                 B(Jump), U8(7),
-                B(Star), R(9),
+                B(Star), R(10),
                 B(LdaZero),
-                B(Star), R(8),
+                B(Star), R(9),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(LdaZero),
-                B(TestEqualStrict), R(4), U8(16),
+                B(TestEqualStrict), R(5), U8(16),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(2), U8(8), U8(17),
-                B(Star), R(6),
+                B(Star), R(7),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(4), U8(19),
+                B(TestEqualStrict), R(5), U8(19),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(6),
+                B(Ldar), R(7),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(11),
-                B(LdaConstant), U8(9),
                 B(Star), R(12),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(11), U8(2),
+                B(LdaConstant), U8(9),
+                B(Star), R(13),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(12), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(11),
-                B(Mov), R(6), R(12),
-                B(Mov), R(2), R(13),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(12), U8(2),
+                B(Mov), R(context), R(12),
+                B(Mov), R(7), R(13),
+                B(Mov), R(2), R(14),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(13), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(11),
+                B(Ldar), R(12),
                 B(Jump), U8(27),
-                B(Mov), R(6), R(11),
-                B(Mov), R(2), R(12),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(11), U8(2),
-                B(Star), R(7),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(7), U8(1),
+                B(Mov), R(7), R(12),
+                B(Mov), R(2), R(13),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(12), U8(2),
+                B(Star), R(8),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(8), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(7), U8(1),
-                B(Ldar), R(10),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(8), U8(1),
+                B(Ldar), R(11),
                 B(SetPendingMessage),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(8),
+                B(TestEqualStrictNoFeedback), R(9),
                 B(JumpIfFalse), U8(5),
-                B(Ldar), R(9),
+                B(Ldar), R(10),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   73 S> */ B(Return),
@@ -466,37 +466,37 @@ snippet: "
   }
   f([{ x: 0, y: 3 }, { x: 1, y: 9 }, { x: -12, y: 17 }]);
 "
-frame size: 19
+frame size: 20
 parameter count: 2
 bytecode array length: 286
 bytecodes: [
   /*   10 E> */ B(StackCheck),
                 B(LdaZero),
-                B(Star), R(9),
-                B(Mov), R(context), R(15),
+                B(Star), R(10),
                 B(Mov), R(context), R(16),
+                B(Mov), R(context), R(17),
   /*   41 S> */ B(LdaNamedProperty), R(arg0), U8(0), U8(0),
-                B(Star), R(18),
-                B(CallProperty0), R(18), R(arg0), U8(2),
-                B(Mov), R(arg0), R(17),
+                B(Star), R(19),
+                B(CallProperty0), R(19), R(arg0), U8(2),
+                B(Mov), R(arg0), R(18),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(7),
-  /*   36 S> */ B(LdaNamedProperty), R(7), U8(1), U8(4),
-                B(Star), R(17),
-                B(CallProperty0), R(17), R(7), U8(6),
+  /*   41 E> */ B(LdaNamedProperty), R(7), U8(1), U8(4),
                 B(Star), R(8),
-  /*   36 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(8), U8(1),
+  /*   36 S> */ B(CallProperty0), R(8), R(7), U8(6),
+                B(Star), R(9),
+  /*   36 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(9), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(8), U8(1),
-                B(LdaNamedProperty), R(8), U8(2), U8(8),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1),
+                B(LdaNamedProperty), R(9), U8(2), U8(8),
                 B(JumpIfToBooleanTrue), U8(66),
-                B(LdaNamedProperty), R(8), U8(3), U8(10),
-                B(Star), R(10),
+                B(LdaNamedProperty), R(9), U8(3), U8(10),
+                B(Star), R(11),
                 B(LdaSmi), I8(2),
-                B(Star), R(9),
-                B(Mov), R(10), R(5),
+                B(Star), R(10),
+                B(Mov), R(11), R(5),
   /*   20 E> */ B(StackCheck),
                 B(Mov), R(5), R(6),
                 B(Ldar), R(6),
@@ -504,10 +504,10 @@ bytecodes: [
                 B(Ldar), R(6),
                 B(JumpIfNotNull), U8(16),
                 B(LdaSmi), I8(74),
-                B(Star), R(17),
-                B(LdaConstant), U8(4),
                 B(Star), R(18),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(17), U8(2),
+                B(LdaConstant), U8(4),
+                B(Star), R(19),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(18), U8(2),
   /*   31 E> */ B(Throw),
   /*   31 S> */ B(LdaNamedProperty), R(6), U8(4), U8(12),
                 B(Star), R(1),
@@ -517,77 +517,77 @@ bytecodes: [
   /*   58 E> */ B(Add), R(1), U8(16),
                 B(Star), R(0),
                 B(LdaZero),
-                B(Star), R(9),
-                B(JumpLoop), U8(91), I8(0),
+                B(Star), R(10),
+                B(JumpLoop), U8(85), I8(0),
                 B(Jump), U8(36),
-                B(Star), R(17),
+                B(Star), R(18),
                 B(Ldar), R(closure),
-  /*   56 E> */ B(CreateCatchContext), R(17), U8(6), U8(7),
-                B(PushContext), R(17),
-                B(Star), R(16),
+  /*   56 E> */ B(CreateCatchContext), R(18), U8(6), U8(7),
+                B(PushContext), R(18),
+                B(Star), R(17),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(9), U8(17),
+                B(TestEqualStrict), R(10), U8(17),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(9),
+                B(Star), R(10),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(18),
-                B(CallRuntime), U16(Runtime::kReThrow), R(18), U8(1),
-                B(PopContext), R(17),
+                B(Star), R(19),
+                B(CallRuntime), U16(Runtime::kReThrow), R(19), U8(1),
+                B(PopContext), R(18),
                 B(LdaSmi), I8(-1),
+                B(Star), R(15),
                 B(Star), R(14),
-                B(Star), R(13),
                 B(Jump), U8(7),
-                B(Star), R(14),
+                B(Star), R(15),
                 B(LdaZero),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(15),
+                B(Star), R(16),
                 B(LdaZero),
-                B(TestEqualStrict), R(9), U8(18),
+                B(TestEqualStrict), R(10), U8(18),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(7), U8(8), U8(19),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(9), U8(21),
+                B(TestEqualStrict), R(10), U8(21),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(11),
+                B(Ldar), R(12),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(16),
-                B(LdaConstant), U8(9),
                 B(Star), R(17),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(16), U8(2),
+                B(LdaConstant), U8(9),
+                B(Star), R(18),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(17), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(16),
-                B(Mov), R(11), R(17),
-                B(Mov), R(7), R(18),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(17), U8(2),
+                B(Mov), R(context), R(17),
+                B(Mov), R(12), R(18),
+                B(Mov), R(7), R(19),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(18), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(16),
+                B(Ldar), R(17),
                 B(Jump), U8(27),
-                B(Mov), R(11), R(16),
-                B(Mov), R(7), R(17),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(16), U8(2),
-                B(Star), R(12),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(12), U8(1),
+                B(Mov), R(12), R(17),
+                B(Mov), R(7), R(18),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(17), U8(2),
+                B(Star), R(13),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(13), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(12), U8(1),
-                B(Ldar), R(15),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(13), U8(1),
+                B(Ldar), R(16),
                 B(SetPendingMessage),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(13),
+                B(TestEqualStrictNoFeedback), R(14),
                 B(JumpIfFalse), U8(5),
-                B(Ldar), R(14),
+                B(Ldar), R(15),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   65 S> */ B(Return),
@@ -617,144 +617,144 @@ snippet: "
   }
   f([1, 2, 3]);
 "
-frame size: 19
+frame size: 20
 parameter count: 2
 bytecode array length: 327
 bytecodes: [
                 B(Ldar), R(3),
                 B(JumpIfUndefined), U8(18),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetContext), R(3), U8(1),
-                B(PushContext), R(12),
+                B(PushContext), R(13),
                 B(RestoreGeneratorState), R(3),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(SwitchOnSmiNoFeedback), U8(0), U8(1), I8(0),
                 B(Abort), U8(15),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(CreateFunctionContext), U8(1),
-                B(PushContext), R(12),
+                B(PushContext), R(13),
                 B(Ldar), R(arg0),
                 B(StaCurrentContextSlot), U8(4),
-                B(Mov), R(closure), R(13),
-                B(Mov), R(this), R(14),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(13), U8(2),
+                B(Mov), R(closure), R(14),
+                B(Mov), R(this), R(15),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(14), U8(2),
                 B(Star), R(3),
   /*   11 E> */ B(StackCheck),
-  /*   11 E> */ B(SuspendGenerator), R(3), R(0), U8(13), U8(0),
+  /*   11 E> */ B(SuspendGenerator), R(3), R(0), U8(14), U8(0),
   /*   55 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(3), R(0), U8(13),
+                B(RestoreGeneratorRegisters), R(3), R(0), U8(14),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(3), U8(1),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(3), U8(1),
                 B(SwitchOnSmiNoFeedback), U8(1), U8(2), I8(0),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
   /*   11 E> */ B(Throw),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
   /*   55 S> */ B(Return),
                 B(LdaZero),
-                B(Star), R(7),
-                B(Mov), R(context), R(15),
+                B(Star), R(8),
                 B(Mov), R(context), R(16),
+                B(Mov), R(context), R(17),
   /*   35 S> */ B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(17),
-                B(LdaNamedProperty), R(17), U8(3), U8(0),
                 B(Star), R(18),
-                B(CallProperty0), R(18), R(17), U8(2),
+                B(LdaNamedProperty), R(18), U8(3), U8(0),
+                B(Star), R(19),
+                B(CallProperty0), R(19), R(18), U8(2),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(5),
-  /*   30 S> */ B(LdaNamedProperty), R(5), U8(4), U8(4),
-                B(Star), R(17),
-                B(CallProperty0), R(17), R(5), U8(6),
+  /*   35 E> */ B(LdaNamedProperty), R(5), U8(4), U8(4),
                 B(Star), R(6),
-  /*   30 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(6), U8(1),
+  /*   30 S> */ B(CallProperty0), R(6), R(5), U8(6),
+                B(Star), R(7),
+  /*   30 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(7), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
-                B(LdaNamedProperty), R(6), U8(5), U8(8),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(7), U8(1),
+                B(LdaNamedProperty), R(7), U8(5), U8(8),
                 B(JumpIfToBooleanTrue), U8(28),
-                B(LdaNamedProperty), R(6), U8(6), U8(10),
-                B(Star), R(8),
+                B(LdaNamedProperty), R(7), U8(6), U8(10),
+                B(Star), R(9),
                 B(LdaSmi), I8(2),
-                B(Star), R(7),
-                B(Mov), R(8), R(4),
+                B(Star), R(8),
+                B(Mov), R(9), R(4),
   /*   21 E> */ B(StackCheck),
                 B(Mov), R(4), R(1),
   /*   50 S> */ B(Mov), R(1), R(0),
                 B(LdaZero),
-                B(Star), R(7),
-                B(JumpLoop), U8(53), I8(0),
+                B(Star), R(8),
+                B(JumpLoop), U8(47), I8(0),
                 B(Jump), U8(36),
-                B(Star), R(17),
+                B(Star), R(18),
                 B(Ldar), R(closure),
-  /*   50 E> */ B(CreateCatchContext), R(17), U8(7), U8(8),
-                B(PushContext), R(17),
-                B(Star), R(16),
+  /*   50 E> */ B(CreateCatchContext), R(18), U8(7), U8(8),
+                B(PushContext), R(18),
+                B(Star), R(17),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(7), U8(12),
+                B(TestEqualStrict), R(8), U8(12),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(7),
+                B(Star), R(8),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(18),
-                B(CallRuntime), U16(Runtime::kReThrow), R(18), U8(1),
-                B(PopContext), R(17),
+                B(Star), R(19),
+                B(CallRuntime), U16(Runtime::kReThrow), R(19), U8(1),
+                B(PopContext), R(18),
                 B(LdaSmi), I8(-1),
+                B(Star), R(15),
                 B(Star), R(14),
-                B(Star), R(13),
                 B(Jump), U8(7),
-                B(Star), R(14),
+                B(Star), R(15),
                 B(LdaZero),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(15),
+                B(Star), R(16),
                 B(LdaZero),
-                B(TestEqualStrict), R(7), U8(13),
+                B(TestEqualStrict), R(8), U8(13),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(5), U8(9), U8(14),
-                B(Star), R(9),
+                B(Star), R(10),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(7), U8(16),
+                B(TestEqualStrict), R(8), U8(16),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(9),
+                B(Ldar), R(10),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(16),
-                B(LdaConstant), U8(10),
                 B(Star), R(17),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(16), U8(2),
+                B(LdaConstant), U8(10),
+                B(Star), R(18),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(17), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(16),
-                B(Mov), R(9), R(17),
-                B(Mov), R(5), R(18),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(17), U8(2),
+                B(Mov), R(context), R(17),
+                B(Mov), R(10), R(18),
+                B(Mov), R(5), R(19),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(18), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(16),
+                B(Ldar), R(17),
                 B(Jump), U8(27),
-                B(Mov), R(9), R(16),
-                B(Mov), R(5), R(17),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(16), U8(2),
-                B(Star), R(10),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(10), U8(1),
+                B(Mov), R(10), R(17),
+                B(Mov), R(5), R(18),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(17), U8(2),
+                B(Star), R(11),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(11), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(10), U8(1),
-                B(Ldar), R(15),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(11), U8(1),
+                B(Ldar), R(16),
                 B(SetPendingMessage),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(13),
+                B(TestEqualStrictNoFeedback), R(14),
                 B(JumpIfFalse), U8(5),
-                B(Ldar), R(14),
+                B(Ldar), R(15),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   55 S> */ B(Return),
@@ -785,182 +785,182 @@ snippet: "
   }
   f([1, 2, 3]);
 "
-frame size: 18
+frame size: 19
 parameter count: 2
 bytecode array length: 394
 bytecodes: [
                 B(Ldar), R(2),
                 B(JumpIfUndefined), U8(18),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetContext), R(2), U8(1),
-                B(PushContext), R(11),
+                B(PushContext), R(12),
                 B(RestoreGeneratorState), R(2),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(SwitchOnSmiNoFeedback), U8(0), U8(2), I8(0),
                 B(Abort), U8(15),
                 B(LdaSmi), I8(-2),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(CreateFunctionContext), U8(1),
-                B(PushContext), R(11),
+                B(PushContext), R(12),
                 B(Ldar), R(arg0),
                 B(StaCurrentContextSlot), U8(4),
-                B(Mov), R(closure), R(12),
-                B(Mov), R(this), R(13),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(12), U8(2),
+                B(Mov), R(closure), R(13),
+                B(Mov), R(this), R(14),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(13), U8(2),
                 B(Star), R(2),
   /*   11 E> */ B(StackCheck),
-  /*   11 E> */ B(SuspendGenerator), R(2), R(0), U8(12), U8(0),
+  /*   11 E> */ B(SuspendGenerator), R(2), R(0), U8(13), U8(0),
   /*   49 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(12),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(13),
                 B(LdaSmi), I8(-2),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(12),
+                B(Star), R(13),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(SwitchOnSmiNoFeedback), U8(2), U8(2), I8(0),
-                B(Ldar), R(12),
+                B(Ldar), R(13),
   /*   11 E> */ B(Throw),
-                B(Ldar), R(12),
+                B(Ldar), R(13),
   /*   49 S> */ B(Return),
                 B(LdaZero),
-                B(Star), R(6),
-                B(Mov), R(context), R(14),
+                B(Star), R(7),
                 B(Mov), R(context), R(15),
+                B(Mov), R(context), R(16),
   /*   35 S> */ B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(16),
-                B(LdaNamedProperty), R(16), U8(4), U8(0),
                 B(Star), R(17),
-                B(CallProperty0), R(17), R(16), U8(2),
+                B(LdaNamedProperty), R(17), U8(4), U8(0),
+                B(Star), R(18),
+                B(CallProperty0), R(18), R(17), U8(2),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(4),
-                B(Ldar), R(10),
-                B(SwitchOnSmiNoFeedback), U8(5), U8(1), I8(1),
+  /*   35 E> */ B(LdaNamedProperty), R(4), U8(5), U8(4),
+                B(Star), R(5),
+                B(Ldar), R(11),
+                B(SwitchOnSmiNoFeedback), U8(6), U8(1), I8(1),
                 B(LdaSmi), I8(-2),
-  /*   35 E> */ B(TestEqualStrictNoFeedback), R(10),
+                B(TestEqualStrictNoFeedback), R(11),
                 B(JumpIfTrue), U8(4),
                 B(Abort), U8(15),
-  /*   30 S> */ B(LdaNamedProperty), R(4), U8(6), U8(4),
-                B(Star), R(16),
-                B(CallProperty0), R(16), R(4), U8(6),
-                B(Star), R(5),
-  /*   30 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(5), U8(1),
+  /*   30 S> */ B(CallProperty0), R(5), R(4), U8(6),
+                B(Star), R(6),
+  /*   30 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(6), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(5), U8(1),
-                B(LdaNamedProperty), R(5), U8(7), U8(8),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
+                B(LdaNamedProperty), R(6), U8(7), U8(8),
                 B(JumpIfToBooleanTrue), U8(74),
-                B(LdaNamedProperty), R(5), U8(8), U8(10),
-                B(Star), R(7),
+                B(LdaNamedProperty), R(6), U8(8), U8(10),
+                B(Star), R(8),
                 B(LdaSmi), I8(2),
-                B(Star), R(6),
-                B(Mov), R(7), R(3),
+                B(Star), R(7),
+                B(Mov), R(8), R(3),
   /*   21 E> */ B(StackCheck),
                 B(Mov), R(3), R(0),
   /*   40 S> */ B(LdaFalse),
-                B(Star), R(17),
-                B(Mov), R(0), R(16),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateIterResultObject), R(16), U8(2),
-                B(SuspendGenerator), R(2), R(0), U8(16), U8(1),
+                B(Star), R(18),
+                B(Mov), R(0), R(17),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateIterResultObject), R(17), U8(2),
+                B(SuspendGenerator), R(2), R(0), U8(17), U8(1),
   /*   49 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(16),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(17),
                 B(LdaSmi), I8(-2),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(16),
+                B(Star), R(17),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(SwitchOnSmiNoFeedback), U8(9), U8(2), I8(0),
-                B(Ldar), R(16),
+                B(Ldar), R(17),
   /*   40 E> */ B(Throw),
                 B(LdaZero),
-                B(Star), R(12),
-                B(Mov), R(16), R(13),
+                B(Star), R(13),
+                B(Mov), R(17), R(14),
                 B(Jump), U8(58),
                 B(LdaZero),
-                B(Star), R(6),
-                B(JumpLoop), U8(113), I8(0),
+                B(Star), R(7),
+                B(JumpLoop), U8(107), I8(0),
                 B(Jump), U8(36),
-                B(Star), R(16),
+                B(Star), R(17),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(16), U8(11), U8(12),
-                B(PushContext), R(16),
-                B(Star), R(15),
+                B(CreateCatchContext), R(17), U8(11), U8(12),
+                B(PushContext), R(17),
+                B(Star), R(16),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(6), U8(12),
+                B(TestEqualStrict), R(7), U8(12),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(6),
+                B(Star), R(7),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(17),
-                B(CallRuntime), U16(Runtime::kReThrow), R(17), U8(1),
-                B(PopContext), R(16),
+                B(Star), R(18),
+                B(CallRuntime), U16(Runtime::kReThrow), R(18), U8(1),
+                B(PopContext), R(17),
                 B(LdaSmi), I8(-1),
+                B(Star), R(14),
                 B(Star), R(13),
-                B(Star), R(12),
                 B(Jump), U8(8),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(LdaSmi), I8(1),
-                B(Star), R(12),
+                B(Star), R(13),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(14),
+                B(Star), R(15),
                 B(LdaZero),
-                B(TestEqualStrict), R(6), U8(13),
+                B(TestEqualStrict), R(7), U8(13),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(4), U8(13), U8(14),
-                B(Star), R(8),
+                B(Star), R(9),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(6), U8(16),
+                B(TestEqualStrict), R(7), U8(16),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(8),
+                B(Ldar), R(9),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(15),
-                B(LdaConstant), U8(14),
                 B(Star), R(16),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(15), U8(2),
+                B(LdaConstant), U8(14),
+                B(Star), R(17),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(16), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(15),
-                B(Mov), R(8), R(16),
-                B(Mov), R(4), R(17),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(16), U8(2),
+                B(Mov), R(context), R(16),
+                B(Mov), R(9), R(17),
+                B(Mov), R(4), R(18),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(17), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(15),
+                B(Ldar), R(16),
                 B(Jump), U8(27),
-                B(Mov), R(8), R(15),
-                B(Mov), R(4), R(16),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(15), U8(2),
-                B(Star), R(9),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(9), U8(1),
+                B(Mov), R(9), R(16),
+                B(Mov), R(4), R(17),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(16), U8(2),
+                B(Star), R(10),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(10), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1),
-                B(Ldar), R(14),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(10), U8(1),
+                B(Ldar), R(15),
                 B(SetPendingMessage),
-                B(Ldar), R(12),
+                B(Ldar), R(13),
                 B(SwitchOnSmiNoFeedback), U8(15), U8(2), I8(0),
                 B(Jump), U8(8),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
   /*   49 S> */ B(Return),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   49 S> */ B(Return),
 ]
 constant pool: [
   Smi [37],
-  Smi [97],
+  Smi [103],
   Smi [10],
   Smi [7],
   SYMBOL_TYPE,
-  Smi [75],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
+  Smi [69],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
   Smi [15],
@@ -985,172 +985,172 @@ snippet: "
   }
   f([1, 2, 3]);
 "
-frame size: 23
+frame size: 24
 parameter count: 2
 bytecode array length: 372
 bytecodes: [
                 B(CreateFunctionContext), U8(1),
-                B(PushContext), R(12),
+                B(PushContext), R(13),
                 B(Ldar), R(arg0),
                 B(StaCurrentContextSlot), U8(4),
   /*   16 E> */ B(StackCheck),
                 B(CallJSRuntime), U8(%async_function_promise_create), R(0), U8(0),
-                B(Star), R(11),
-                B(Mov), R(context), R(15),
+                B(Star), R(12),
                 B(Mov), R(context), R(16),
+                B(Mov), R(context), R(17),
                 B(LdaZero),
-                B(Star), R(7),
-                B(Mov), R(context), R(19),
+                B(Star), R(8),
                 B(Mov), R(context), R(20),
+                B(Mov), R(context), R(21),
   /*   40 S> */ B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(21),
-                B(LdaNamedProperty), R(21), U8(0), U8(0),
                 B(Star), R(22),
-                B(CallProperty0), R(22), R(21), U8(2),
+                B(LdaNamedProperty), R(22), U8(0), U8(0),
+                B(Star), R(23),
+                B(CallProperty0), R(23), R(22), U8(2),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(5),
-  /*   35 S> */ B(LdaNamedProperty), R(5), U8(1), U8(4),
-                B(Star), R(21),
-                B(CallProperty0), R(21), R(5), U8(6),
+  /*   40 E> */ B(LdaNamedProperty), R(5), U8(1), U8(4),
                 B(Star), R(6),
-  /*   35 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(6), U8(1),
+  /*   35 S> */ B(CallProperty0), R(6), R(5), U8(6),
+                B(Star), R(7),
+  /*   35 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(7), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
-                B(LdaNamedProperty), R(6), U8(2), U8(8),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(7), U8(1),
+                B(LdaNamedProperty), R(7), U8(2), U8(8),
                 B(JumpIfToBooleanTrue), U8(28),
-                B(LdaNamedProperty), R(6), U8(3), U8(10),
-                B(Star), R(8),
+                B(LdaNamedProperty), R(7), U8(3), U8(10),
+                B(Star), R(9),
                 B(LdaSmi), I8(2),
-                B(Star), R(7),
-                B(Mov), R(8), R(4),
+                B(Star), R(8),
+                B(Mov), R(9), R(4),
   /*   26 E> */ B(StackCheck),
                 B(Mov), R(4), R(1),
   /*   55 S> */ B(Mov), R(1), R(0),
                 B(LdaZero),
-                B(Star), R(7),
-                B(JumpLoop), U8(53), I8(0),
+                B(Star), R(8),
+                B(JumpLoop), U8(47), I8(0),
                 B(Jump), U8(40),
-                B(Star), R(21),
+                B(Star), R(22),
                 B(Ldar), R(closure),
-  /*   55 E> */ B(CreateCatchContext), R(21), U8(4), U8(5),
-                B(Star), R(20),
+  /*   55 E> */ B(CreateCatchContext), R(22), U8(4), U8(5),
+                B(Star), R(21),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(20),
-                B(PushContext), R(21),
+                B(Ldar), R(21),
+                B(PushContext), R(22),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(7), U8(12),
+                B(TestEqualStrict), R(8), U8(12),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(7),
+                B(Star), R(8),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(22),
-                B(CallRuntime), U16(Runtime::kReThrow), R(22), U8(1),
-                B(PopContext), R(21),
+                B(Star), R(23),
+                B(CallRuntime), U16(Runtime::kReThrow), R(23), U8(1),
+                B(PopContext), R(22),
                 B(LdaSmi), I8(-1),
+                B(Star), R(19),
                 B(Star), R(18),
-                B(Star), R(17),
                 B(Jump), U8(7),
-                B(Star), R(18),
+                B(Star), R(19),
                 B(LdaZero),
-                B(Star), R(17),
+                B(Star), R(18),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(19),
+                B(Star), R(20),
                 B(LdaZero),
-                B(TestEqualStrict), R(7), U8(13),
+                B(TestEqualStrict), R(8), U8(13),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(5), U8(6), U8(14),
-                B(Star), R(9),
+                B(Star), R(10),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(7), U8(16),
+                B(TestEqualStrict), R(8), U8(16),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(9),
+                B(Ldar), R(10),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(20),
-                B(LdaConstant), U8(7),
                 B(Star), R(21),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(20), U8(2),
+                B(LdaConstant), U8(7),
+                B(Star), R(22),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(21), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(20),
-                B(Mov), R(9), R(21),
-                B(Mov), R(5), R(22),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(21), U8(2),
+                B(Mov), R(context), R(21),
+                B(Mov), R(10), R(22),
+                B(Mov), R(5), R(23),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(22), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(20),
+                B(Ldar), R(21),
                 B(Jump), U8(27),
-                B(Mov), R(9), R(20),
-                B(Mov), R(5), R(21),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(20), U8(2),
-                B(Star), R(10),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(10), U8(1),
+                B(Mov), R(10), R(21),
+                B(Mov), R(5), R(22),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(21), U8(2),
+                B(Star), R(11),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(11), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(10), U8(1),
-                B(Ldar), R(19),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(11), U8(1),
+                B(Ldar), R(20),
                 B(SetPendingMessage),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(17),
+                B(TestEqualStrictNoFeedback), R(18),
                 B(JumpIfFalse), U8(5),
-                B(Ldar), R(18),
+                B(Ldar), R(19),
                 B(ReThrow),
                 B(LdaUndefined),
-                B(Star), R(18),
-                B(Mov), R(11), R(17),
-                B(CallJSRuntime), U8(%promise_resolve), R(17), U8(2),
+                B(Star), R(19),
+                B(Mov), R(12), R(18),
+                B(CallJSRuntime), U8(%promise_resolve), R(18), U8(2),
                 B(LdaZero),
-                B(Star), R(13),
-                B(Mov), R(11), R(14),
+                B(Star), R(14),
+                B(Mov), R(12), R(15),
                 B(Jump), U8(58),
                 B(Jump), U8(42),
-                B(Star), R(17),
+                B(Star), R(18),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(17), U8(4), U8(8),
-                B(Star), R(16),
+                B(CreateCatchContext), R(18), U8(4), U8(8),
+                B(Star), R(17),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(16),
-                B(PushContext), R(17),
+                B(Ldar), R(17),
+                B(PushContext), R(18),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(19),
-                B(LdaFalse),
                 B(Star), R(20),
-                B(Mov), R(11), R(18),
-                B(CallJSRuntime), U8(%promise_internal_reject), R(18), U8(3),
-                B(PopContext), R(17),
+                B(LdaFalse),
+                B(Star), R(21),
+                B(Mov), R(12), R(19),
+                B(CallJSRuntime), U8(%promise_internal_reject), R(19), U8(3),
+                B(PopContext), R(18),
                 B(LdaZero),
-                B(Star), R(13),
-                B(Mov), R(11), R(14),
+                B(Star), R(14),
+                B(Mov), R(12), R(15),
                 B(Jump), U8(16),
                 B(LdaSmi), I8(-1),
+                B(Star), R(15),
                 B(Star), R(14),
-                B(Star), R(13),
                 B(Jump), U8(8),
-                B(Star), R(14),
+                B(Star), R(15),
                 B(LdaSmi), I8(1),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(15),
-                B(CallJSRuntime), U8(%async_function_promise_release), R(11), U8(1),
-                B(Ldar), R(15),
+                B(Star), R(16),
+                B(CallJSRuntime), U8(%async_function_promise_release), R(12), U8(1),
+                B(Ldar), R(16),
                 B(SetPendingMessage),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
                 B(SwitchOnSmiNoFeedback), U8(9), U8(2), I8(0),
                 B(Jump), U8(8),
-                B(Ldar), R(14),
+                B(Ldar), R(15),
   /*   60 S> */ B(Return),
-                B(Ldar), R(14),
+                B(Ldar), R(15),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   60 S> */ B(Return),
@@ -1183,218 +1183,218 @@ snippet: "
   }
   f([1, 2, 3]);
 "
-frame size: 24
+frame size: 25
 parameter count: 2
 bytecode array length: 466
 bytecodes: [
                 B(Ldar), R(2),
                 B(JumpIfUndefined), U8(18),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetContext), R(2), U8(1),
-                B(PushContext), R(12),
+                B(PushContext), R(13),
                 B(RestoreGeneratorState), R(2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(SwitchOnSmiNoFeedback), U8(0), U8(1), I8(0),
                 B(Abort), U8(15),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(CreateFunctionContext), U8(1),
-                B(PushContext), R(12),
+                B(PushContext), R(13),
                 B(Ldar), R(arg0),
                 B(StaCurrentContextSlot), U8(4),
-                B(Mov), R(closure), R(13),
-                B(Mov), R(this), R(14),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(13), U8(2),
+                B(Mov), R(closure), R(14),
+                B(Mov), R(this), R(15),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(14), U8(2),
                 B(Star), R(2),
   /*   16 E> */ B(StackCheck),
                 B(CallJSRuntime), U8(%async_function_promise_create), R(0), U8(0),
-                B(Star), R(10),
-                B(Mov), R(context), R(15),
+                B(Star), R(11),
                 B(Mov), R(context), R(16),
+                B(Mov), R(context), R(17),
                 B(LdaZero),
-                B(Star), R(6),
-                B(Mov), R(context), R(19),
+                B(Star), R(7),
                 B(Mov), R(context), R(20),
+                B(Mov), R(context), R(21),
   /*   40 S> */ B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(21),
-                B(LdaNamedProperty), R(21), U8(1), U8(0),
                 B(Star), R(22),
-                B(CallProperty0), R(22), R(21), U8(2),
+                B(LdaNamedProperty), R(22), U8(1), U8(0),
+                B(Star), R(23),
+                B(CallProperty0), R(23), R(22), U8(2),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(4),
-                B(Ldar), R(11),
-                B(SwitchOnSmiNoFeedback), U8(2), U8(1), I8(0),
+  /*   40 E> */ B(LdaNamedProperty), R(4), U8(2), U8(4),
+                B(Star), R(5),
+                B(Ldar), R(12),
+                B(SwitchOnSmiNoFeedback), U8(3), U8(1), I8(0),
                 B(LdaSmi), I8(-2),
-  /*   40 E> */ B(TestEqualStrictNoFeedback), R(11),
+                B(TestEqualStrictNoFeedback), R(12),
                 B(JumpIfTrue), U8(4),
                 B(Abort), U8(15),
-  /*   35 S> */ B(LdaNamedProperty), R(4), U8(3), U8(4),
-                B(Star), R(21),
-                B(CallProperty0), R(21), R(4), U8(6),
-                B(Star), R(5),
-  /*   35 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(5), U8(1),
+  /*   35 S> */ B(CallProperty0), R(5), R(4), U8(6),
+                B(Star), R(6),
+  /*   35 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(6), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(5), U8(1),
-                B(LdaNamedProperty), R(5), U8(4), U8(8),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
+                B(LdaNamedProperty), R(6), U8(4), U8(8),
                 B(JumpIfToBooleanTrue), U8(72),
-                B(LdaNamedProperty), R(5), U8(5), U8(10),
-                B(Star), R(7),
+                B(LdaNamedProperty), R(6), U8(5), U8(10),
+                B(Star), R(8),
                 B(LdaSmi), I8(2),
-                B(Star), R(6),
-                B(Mov), R(7), R(3),
+                B(Star), R(7),
+                B(Mov), R(8), R(3),
   /*   26 E> */ B(StackCheck),
                 B(Mov), R(3), R(0),
-  /*   45 S> */ B(Mov), R(2), R(21),
-                B(Mov), R(0), R(22),
-                B(Mov), R(10), R(23),
-                B(CallJSRuntime), U8(%async_function_await_uncaught), R(21), U8(3),
-                B(SuspendGenerator), R(2), R(0), U8(21), U8(0),
+  /*   45 S> */ B(Mov), R(2), R(22),
+                B(Mov), R(0), R(23),
+                B(Mov), R(11), R(24),
+                B(CallJSRuntime), U8(%async_function_await_uncaught), R(22), U8(3),
+                B(SuspendGenerator), R(2), R(0), U8(22), U8(0),
   /*   54 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(21),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(22),
                 B(LdaSmi), I8(-2),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(21),
-                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(Star), R(22),
+                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
+                B(Star), R(23),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(22),
+                B(TestEqualStrictNoFeedback), R(23),
                 B(JumpIfTrue), U8(5),
-                B(Ldar), R(21),
+                B(Ldar), R(22),
                 B(ReThrow),
                 B(LdaZero),
-                B(Star), R(6),
-                B(JumpLoop), U8(111), I8(0),
+                B(Star), R(7),
+                B(JumpLoop), U8(105), I8(0),
                 B(Jump), U8(40),
-                B(Star), R(21),
+                B(Star), R(22),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(21), U8(6), U8(7),
-                B(Star), R(20),
+                B(CreateCatchContext), R(22), U8(6), U8(7),
+                B(Star), R(21),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(20),
-                B(PushContext), R(21),
+                B(Ldar), R(21),
+                B(PushContext), R(22),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(6), U8(12),
+                B(TestEqualStrict), R(7), U8(12),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(6),
+                B(Star), R(7),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(22),
-                B(CallRuntime), U16(Runtime::kReThrow), R(22), U8(1),
-                B(PopContext), R(21),
+                B(Star), R(23),
+                B(CallRuntime), U16(Runtime::kReThrow), R(23), U8(1),
+                B(PopContext), R(22),
                 B(LdaSmi), I8(-1),
+                B(Star), R(19),
                 B(Star), R(18),
-                B(Star), R(17),
                 B(Jump), U8(7),
-                B(Star), R(18),
+                B(Star), R(19),
                 B(LdaZero),
-                B(Star), R(17),
+                B(Star), R(18),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(19),
+                B(Star), R(20),
                 B(LdaZero),
-                B(TestEqualStrict), R(6), U8(13),
+                B(TestEqualStrict), R(7), U8(13),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(4), U8(8), U8(14),
-                B(Star), R(8),
+                B(Star), R(9),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(6), U8(16),
+                B(TestEqualStrict), R(7), U8(16),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(8),
+                B(Ldar), R(9),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(20),
-                B(LdaConstant), U8(9),
                 B(Star), R(21),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(20), U8(2),
+                B(LdaConstant), U8(9),
+                B(Star), R(22),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(21), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(20),
-                B(Mov), R(8), R(21),
-                B(Mov), R(4), R(22),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(21), U8(2),
+                B(Mov), R(context), R(21),
+                B(Mov), R(9), R(22),
+                B(Mov), R(4), R(23),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(22), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(20),
+                B(Ldar), R(21),
                 B(Jump), U8(27),
-                B(Mov), R(8), R(20),
-                B(Mov), R(4), R(21),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(20), U8(2),
-                B(Star), R(9),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(9), U8(1),
+                B(Mov), R(9), R(21),
+                B(Mov), R(4), R(22),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(21), U8(2),
+                B(Star), R(10),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(10), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1),
-                B(Ldar), R(19),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(10), U8(1),
+                B(Ldar), R(20),
                 B(SetPendingMessage),
                 B(LdaZero),
-                B(TestEqualStrictNoFeedback), R(17),
+                B(TestEqualStrictNoFeedback), R(18),
                 B(JumpIfFalse), U8(5),
-                B(Ldar), R(18),
+                B(Ldar), R(19),
                 B(ReThrow),
                 B(LdaUndefined),
-                B(Star), R(18),
-                B(Mov), R(10), R(17),
-                B(CallJSRuntime), U8(%promise_resolve), R(17), U8(2),
+                B(Star), R(19),
+                B(Mov), R(11), R(18),
+                B(CallJSRuntime), U8(%promise_resolve), R(18), U8(2),
                 B(LdaZero),
-                B(Star), R(13),
-                B(Mov), R(10), R(14),
+                B(Star), R(14),
+                B(Mov), R(11), R(15),
                 B(Jump), U8(58),
                 B(Jump), U8(42),
-                B(Star), R(17),
+                B(Star), R(18),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(17), U8(6), U8(10),
-                B(Star), R(16),
+                B(CreateCatchContext), R(18), U8(6), U8(10),
+                B(Star), R(17),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(16),
-                B(PushContext), R(17),
+                B(Ldar), R(17),
+                B(PushContext), R(18),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(19),
-                B(LdaFalse),
                 B(Star), R(20),
-                B(Mov), R(10), R(18),
-                B(CallJSRuntime), U8(%promise_internal_reject), R(18), U8(3),
-                B(PopContext), R(17),
+                B(LdaFalse),
+                B(Star), R(21),
+                B(Mov), R(11), R(19),
+                B(CallJSRuntime), U8(%promise_internal_reject), R(19), U8(3),
+                B(PopContext), R(18),
                 B(LdaZero),
-                B(Star), R(13),
-                B(Mov), R(10), R(14),
+                B(Star), R(14),
+                B(Mov), R(11), R(15),
                 B(Jump), U8(16),
                 B(LdaSmi), I8(-1),
+                B(Star), R(15),
                 B(Star), R(14),
-                B(Star), R(13),
                 B(Jump), U8(8),
-                B(Star), R(14),
+                B(Star), R(15),
                 B(LdaSmi), I8(1),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(15),
-                B(CallJSRuntime), U8(%async_function_promise_release), R(10), U8(1),
-                B(Ldar), R(15),
+                B(Star), R(16),
+                B(CallJSRuntime), U8(%async_function_promise_release), R(11), U8(1),
+                B(Ldar), R(16),
                 B(SetPendingMessage),
-                B(Ldar), R(13),
+                B(Ldar), R(14),
                 B(SwitchOnSmiNoFeedback), U8(11), U8(2), I8(0),
                 B(Jump), U8(8),
-                B(Ldar), R(14),
+                B(Ldar), R(15),
   /*   54 S> */ B(Return),
-                B(Ldar), R(14),
+                B(Ldar), R(15),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   54 S> */ B(Return),
 ]
 constant pool: [
-  Smi [75],
+  Smi [81],
   SYMBOL_TYPE,
-  Smi [78],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
+  Smi [72],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE [".catch"],

test/cctest/interpreter/bytecode_expectations/Generators.golden

@@ -128,179 +128,179 @@ snippet: "
   function* f() { for (let x of [42]) yield x }
   f();
 "
-frame size: 17
+frame size: 18
 parameter count: 1
 bytecode array length: 388
 bytecodes: [
                 B(Ldar), R(2),
                 B(JumpIfUndefined), U8(18),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetContext), R(2), U8(1),
-                B(PushContext), R(11),
+                B(PushContext), R(12),
                 B(RestoreGeneratorState), R(2),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(SwitchOnSmiNoFeedback), U8(0), U8(2), I8(0),
                 B(Abort), U8(15),
                 B(LdaSmi), I8(-2),
-                B(Star), R(10),
-                B(Mov), R(closure), R(11),
-                B(Mov), R(this), R(12),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(11), U8(2),
+                B(Star), R(11),
+                B(Mov), R(closure), R(12),
+                B(Mov), R(this), R(13),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateJSGeneratorObject), R(12), U8(2),
                 B(Star), R(2),
   /*   11 E> */ B(StackCheck),
-  /*   11 E> */ B(SuspendGenerator), R(2), R(0), U8(11), U8(0),
+  /*   11 E> */ B(SuspendGenerator), R(2), R(0), U8(12), U8(0),
   /*   44 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(11),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(12),
                 B(LdaSmi), I8(-2),
-                B(Star), R(10),
-                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
                 B(Star), R(11),
+                B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
+                B(Star), R(12),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(SwitchOnSmiNoFeedback), U8(2), U8(2), I8(0),
-                B(Ldar), R(11),
+                B(Ldar), R(12),
   /*   11 E> */ B(Throw),
-                B(Ldar), R(11),
+                B(Ldar), R(12),
   /*   44 S> */ B(Return),
                 B(LdaZero),
-                B(Star), R(6),
-                B(Mov), R(context), R(13),
+                B(Star), R(7),
                 B(Mov), R(context), R(14),
+                B(Mov), R(context), R(15),
   /*   30 S> */ B(CreateArrayLiteral), U8(4), U8(0), U8(37),
-                B(Star), R(15),
-                B(LdaNamedProperty), R(15), U8(5), U8(1),
                 B(Star), R(16),
-                B(CallProperty0), R(16), R(15), U8(3),
+                B(LdaNamedProperty), R(16), U8(5), U8(1),
+                B(Star), R(17),
+                B(CallProperty0), R(17), R(16), U8(3),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(4),
-                B(Ldar), R(10),
-                B(SwitchOnSmiNoFeedback), U8(6), U8(1), I8(1),
+  /*   30 E> */ B(LdaNamedProperty), R(4), U8(6), U8(5),
+                B(Star), R(5),
+                B(Ldar), R(11),
+                B(SwitchOnSmiNoFeedback), U8(7), U8(1), I8(1),
                 B(LdaSmi), I8(-2),
-  /*   30 E> */ B(TestEqualStrictNoFeedback), R(10),
+                B(TestEqualStrictNoFeedback), R(11),
                 B(JumpIfTrue), U8(4),
                 B(Abort), U8(15),
-  /*   25 S> */ B(LdaNamedProperty), R(4), U8(7), U8(5),
-                B(Star), R(15),
-                B(CallProperty0), R(15), R(4), U8(7),
-                B(Star), R(5),
-  /*   25 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(5), U8(1),
+  /*   25 S> */ B(CallProperty0), R(5), R(4), U8(7),
+                B(Star), R(6),
+  /*   25 E> */ B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(6), U8(1),
                 B(ToBooleanLogicalNot),
                 B(JumpIfFalse), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(5), U8(1),
-                B(LdaNamedProperty), R(5), U8(8), U8(9),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(6), U8(1),
+                B(LdaNamedProperty), R(6), U8(8), U8(9),
                 B(JumpIfToBooleanTrue), U8(74),
-                B(LdaNamedProperty), R(5), U8(9), U8(11),
-                B(Star), R(7),
+                B(LdaNamedProperty), R(6), U8(9), U8(11),
+                B(Star), R(8),
                 B(LdaSmi), I8(2),
-                B(Star), R(6),
-                B(Mov), R(7), R(3),
+                B(Star), R(7),
+                B(Mov), R(8), R(3),
   /*   16 E> */ B(StackCheck),
                 B(Mov), R(3), R(0),
   /*   36 S> */ B(LdaFalse),
-                B(Star), R(16),
-                B(Mov), R(0), R(15),
-                B(InvokeIntrinsic), U8(Runtime::k_CreateIterResultObject), R(15), U8(2),
-                B(SuspendGenerator), R(2), R(0), U8(15), U8(1),
+                B(Star), R(17),
+                B(Mov), R(0), R(16),
+                B(InvokeIntrinsic), U8(Runtime::k_CreateIterResultObject), R(16), U8(2),
+                B(SuspendGenerator), R(2), R(0), U8(16), U8(1),
   /*   44 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(2), R(0), U8(15),
+                B(RestoreGeneratorRegisters), R(2), R(0), U8(16),
                 B(LdaSmi), I8(-2),
-                B(Star), R(10),
+                B(Star), R(11),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(2), U8(1),
-                B(Star), R(15),
+                B(Star), R(16),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(2), U8(1),
                 B(SwitchOnSmiNoFeedback), U8(10), U8(2), I8(0),
-                B(Ldar), R(15),
+                B(Ldar), R(16),
   /*   36 E> */ B(Throw),
                 B(LdaZero),
-                B(Star), R(11),
-                B(Mov), R(15), R(12),
+                B(Star), R(12),
+                B(Mov), R(16), R(13),
                 B(Jump), U8(58),
                 B(LdaZero),
-                B(Star), R(6),
-                B(JumpLoop), U8(113), I8(0),
+                B(Star), R(7),
+                B(JumpLoop), U8(107), I8(0),
                 B(Jump), U8(36),
-                B(Star), R(15),
+                B(Star), R(16),
                 B(Ldar), R(closure),
-                B(CreateCatchContext), R(15), U8(12), U8(13),
-                B(PushContext), R(15),
-                B(Star), R(14),
+                B(CreateCatchContext), R(16), U8(12), U8(13),
+                B(PushContext), R(16),
+                B(Star), R(15),
                 B(LdaSmi), I8(2),
-                B(TestEqualStrict), R(6), U8(13),
+                B(TestEqualStrict), R(7), U8(13),
                 B(JumpIfFalse), U8(6),
                 B(LdaSmi), I8(1),
-                B(Star), R(6),
+                B(Star), R(7),
                 B(LdaImmutableCurrentContextSlot), U8(4),
-                B(Star), R(16),
-                B(CallRuntime), U16(Runtime::kReThrow), R(16), U8(1),
-                B(PopContext), R(15),
+                B(Star), R(17),
+                B(CallRuntime), U16(Runtime::kReThrow), R(17), U8(1),
+                B(PopContext), R(16),
                 B(LdaSmi), I8(-1),
+                B(Star), R(13),
                 B(Star), R(12),
-                B(Star), R(11),
                 B(Jump), U8(8),
-                B(Star), R(12),
+                B(Star), R(13),
                 B(LdaSmi), I8(1),
-                B(Star), R(11),
+                B(Star), R(12),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Star), R(13),
+                B(Star), R(14),
                 B(LdaZero),
-                B(TestEqualStrict), R(6), U8(14),
+                B(TestEqualStrict), R(7), U8(14),
                 B(JumpIfTrue), U8(90),
                 B(LdaNamedProperty), R(4), U8(14), U8(15),
-                B(Star), R(8),
+                B(Star), R(9),
                 B(TestUndetectable),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(79),
                 B(LdaSmi), I8(1),
-                B(TestEqualStrict), R(6), U8(17),
+                B(TestEqualStrict), R(7), U8(17),
                 B(JumpIfFalse), U8(47),
-                B(Ldar), R(8),
+                B(Ldar), R(9),
                 B(TestTypeOf), U8(6),
                 B(JumpIfFalse), U8(4),
                 B(Jump), U8(18),
                 B(Wide), B(LdaSmi), I16(144),
-                B(Star), R(14),
-                B(LdaConstant), U8(15),
                 B(Star), R(15),
-                B(CallRuntime), U16(Runtime::kNewTypeError), R(14), U8(2),
+                B(LdaConstant), U8(15),
+                B(Star), R(16),
+                B(CallRuntime), U16(Runtime::kNewTypeError), R(15), U8(2),
                 B(Throw),
-                B(Mov), R(context), R(14),
-                B(Mov), R(8), R(15),
-                B(Mov), R(4), R(16),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(15), U8(2),
+                B(Mov), R(context), R(15),
+                B(Mov), R(9), R(16),
+                B(Mov), R(4), R(17),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(16), U8(2),
                 B(Jump), U8(6),
                 B(LdaTheHole),
                 B(SetPendingMessage),
-                B(Ldar), R(14),
+                B(Ldar), R(15),
                 B(Jump), U8(27),
-                B(Mov), R(8), R(14),
-                B(Mov), R(4), R(15),
-                B(InvokeIntrinsic), U8(Runtime::k_Call), R(14), U8(2),
-                B(Star), R(9),
-                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(9), U8(1),
+                B(Mov), R(9), R(15),
+                B(Mov), R(4), R(16),
+                B(InvokeIntrinsic), U8(Runtime::k_Call), R(15), U8(2),
+                B(Star), R(10),
+                B(InvokeIntrinsic), U8(Runtime::k_IsJSReceiver), R(10), U8(1),
                 B(JumpIfToBooleanFalse), U8(4),
                 B(Jump), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1),
-                B(Ldar), R(13),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(10), U8(1),
+                B(Ldar), R(14),
                 B(SetPendingMessage),
-                B(Ldar), R(11),
+                B(Ldar), R(12),
                 B(SwitchOnSmiNoFeedback), U8(16), U8(2), I8(0),
                 B(Jump), U8(8),
-                B(Ldar), R(12),
+                B(Ldar), R(13),
   /*   44 S> */ B(Return),
-                B(Ldar), R(12),
+                B(Ldar), R(13),
                 B(ReThrow),
                 B(LdaUndefined),
   /*   44 S> */ B(Return),
 ]
 constant pool: [
   Smi [29],
-  Smi [91],
+  Smi [97],
   Smi [10],
   Smi [7],
   TUPLE2_TYPE,
   SYMBOL_TYPE,
-  Smi [75],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
+  Smi [69],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["value"],
   Smi [15],
@@ -324,9 +324,9 @@ snippet: "
   function* f() { yield* g() }
   f();
 "
-frame size: 9
+frame size: 10
 parameter count: 1
-bytecode array length: 265
+bytecode array length: 269
 bytecodes: [
                 B(Ldar), R(0),
                 B(JumpIfUndefined), U8(18),
@@ -357,52 +357,54 @@ bytecodes: [
                 B(Ldar), R(2),
   /*   54 S> */ B(Return),
   /*   43 S> */ B(LdaGlobal), U8(4), U8(0),
-                B(Star), R(8),
-  /*   50 E> */ B(CallUndefinedReceiver0), R(8), U8(2),
-                B(Star), R(6),
-                B(LdaNamedProperty), R(6), U8(5), U8(4),
+                B(Star), R(9),
+  /*   50 E> */ B(CallUndefinedReceiver0), R(9), U8(2),
                 B(Star), R(7),
-                B(CallProperty0), R(7), R(6), U8(6),
+                B(LdaNamedProperty), R(7), U8(5), U8(4),
+                B(Star), R(8),
+                B(CallProperty0), R(8), R(7), U8(6),
                 B(JumpIfJSReceiver), U8(7),
                 B(CallRuntime), U16(Runtime::kThrowSymbolIteratorInvalid), R(0), U8(0),
                 B(Star), R(4),
+                B(LdaNamedProperty), R(4), U8(6), U8(8),
+                B(Star), R(6),
                 B(LdaUndefined),
                 B(Star), R(5),
                 B(LdaZero),
                 B(Star), R(3),
                 B(Ldar), R(1),
-                B(SwitchOnSmiNoFeedback), U8(6), U8(1), I8(1),
+                B(SwitchOnSmiNoFeedback), U8(7), U8(1), I8(1),
                 B(LdaSmi), I8(-2),
                 B(TestEqualStrictNoFeedback), R(1),
                 B(JumpIfTrue), U8(4),
                 B(Abort), U8(15),
                 B(Ldar), R(3),
-                B(SwitchOnSmiNoFeedback), U8(7), U8(2), I8(1),
-                B(LdaNamedProperty), R(4), U8(9), U8(8),
-                B(Star), R(8),
-                B(CallProperty1), R(8), R(4), R(5), U8(10),
-                B(Jump), U8(65),
+                B(SwitchOnSmiNoFeedback), U8(8), U8(2), I8(1),
+                B(CallProperty1), R(6), R(4), R(5), U8(10),
+                B(Jump), U8(69),
                 B(LdaNamedProperty), R(4), U8(10), U8(12),
                 B(JumpIfUndefined), U8(13),
                 B(JumpIfNull), U8(11),
-                B(Star), R(8),
-                B(CallProperty1), R(8), R(4), R(5), U8(14),
-                B(Jump), U8(48),
+                B(Star), R(9),
+                B(CallProperty1), R(9), R(4), R(5), U8(14),
+                B(Jump), U8(52),
                 B(Ldar), R(5),
   /*   54 S> */ B(Return),
                 B(LdaNamedProperty), R(4), U8(11), U8(16),
                 B(JumpIfUndefined), U8(13),
                 B(JumpIfNull), U8(11),
-                B(Star), R(8),
-                B(CallProperty1), R(8), R(4), R(5), U8(18),
-                B(Jump), U8(28),
+                B(Star), R(9),
+                B(CallProperty1), R(9), R(4), R(5), U8(18),
+                B(Jump), U8(32),
                 B(LdaNamedProperty), R(4), U8(10), U8(20),
-                B(Star), R(8),
-                B(JumpIfUndefined), U8(15),
-                B(JumpIfNull), U8(13),
-                B(CallProperty0), R(8), R(4), U8(22),
-                B(JumpIfJSReceiver), U8(7),
-                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(2), U8(1),
+                B(JumpIfUndefined), U8(21),
+                B(JumpIfNull), U8(19),
+                B(Star), R(9),
+                B(CallProperty0), R(9), R(4), U8(22),
+                B(Jump), U8(2),
+                B(JumpIfJSReceiver), U8(9),
+                B(Star), R(9),
+                B(CallRuntime), U16(Runtime::kThrowIteratorResultNotAnObject), R(9), U8(1),
                 B(CallRuntime), U16(Runtime::kThrowThrowMethodMissing), R(0), U8(0),
                 B(Star), R(2),
                 B(JumpIfJSReceiver), U8(7),
@@ -410,16 +412,16 @@ bytecodes: [
                 B(LdaNamedProperty), R(2), U8(12), U8(24),
                 B(JumpIfToBooleanTrue), U8(33),
                 B(Ldar), R(2),
-                B(SuspendGenerator), R(0), R(0), U8(8), U8(1),
+                B(SuspendGenerator), R(0), R(0), U8(9), U8(1),
   /*   54 S> */ B(Return),
-                B(RestoreGeneratorRegisters), R(0), R(0), U8(8),
+                B(RestoreGeneratorRegisters), R(0), R(0), U8(9),
                 B(LdaSmi), I8(-2),
                 B(Star), R(1),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetInputOrDebugPos), R(0), U8(1),
                 B(Star), R(5),
                 B(InvokeIntrinsic), U8(Runtime::k_GeneratorGetResumeMode), R(0), U8(1),
                 B(Star), R(3),
-                B(JumpLoop), U8(139), I8(0),
+                B(JumpLoop), U8(137), I8(0),
                 B(LdaNamedProperty), R(2), U8(13), U8(26),
                 B(Star), R(4),
                 B(LdaSmi), I8(1),
@@ -432,15 +434,15 @@ bytecodes: [
 ]
 constant pool: [
   Smi [29],
-  Smi [92],
+  Smi [98],
   Smi [10],
   Smi [7],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["g"],
   SYMBOL_TYPE,
-  Smi [117],
-  Smi [17],
-  Smi [37],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["next"],
+  Smi [115],
+  Smi [11],
+  Smi [31],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["return"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["throw"],
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["done"],

test/inspector/debugger/for-of-loops-expected.txt

@@ -9,10 +9,10 @@ function testFunction() {
   var arr = |_|[1];
   var all = |_|[];
   for (var |_|k in |_|arr) { all.|C|push(k); }
-  for (var |_|k of |_|arr) { all.|C|push(k); }
+  for (var |C|k of |_|arr) { all.|C|push(k); }
   for (var |_|k in |_|obj) { all.|C|push(k); }
   for (let |_|k in |_|arr) { all.|C|push(k); }
-  for (let |_|k of |_|arr) { all.|C|push(k); }
+  for (let |C|k of |_|arr) { all.|C|push(k); }
   for (let |_|k in |_|obj) { all.|C|push(k); }
 
   var iterable = |_|{
@@ -28,9 +28,9 @@ function testFunction() {
       };|R|
     }
   };
-  for (var |_|k of |_|iterable) { all.|C|push(k); }
+  for (var |C|k of |_|iterable) { all.|C|push(k); }
   |_|iterable.i = 0;
-  for (let |_|k of |_|iterable) { all.|C|push(k); }
+  for (let |C|k of |_|iterable) { all.|C|push(k); }
 |R|}
 
 (anonymous) (expr.js:0:0)

test/inspector/debugger/get-possible-breakpoints-master-expected.txt

@@ -95,10 +95,10 @@ function testForLoop() {
 |R|}
 
 function testForOfLoop() {
-  for (var |_|k of |_|[]) {}
-  for (var |_|k of |_|[1]) |_|k;
+  for (var |C|k of |_|[]) {}
+  for (var |C|k of |_|[1]) |_|k;
   var a = |_|[];
-  for (var |_|k of |_|a) {}
+  for (var |C|k of |_|a) {}
 |R|}
 
 function testForInLoop() {

test/mjsunit/es6/call-with-spread-modify-next.js

@@ -37,6 +37,8 @@
 
   var r2 = testMax(1, 2);
 
-  assertEquals(3, called);
+  // .next() is only loaded once during the iteration prologue (see
+  // https://github.com/tc39/ecma262/pull/988/ and v8:6861)
+  assertEquals(1, called);
   assertEquals(2, r2);
 })();

test/mjsunit/es6/iteration-semantics.js

@@ -220,13 +220,11 @@ assertThrows('fold(sum, 0, unreachable({}))', TypeError);
 assertThrows('fold(sum, 0, unreachable(false))', TypeError);
 assertThrows('fold(sum, 0, unreachable(37))', TypeError);
 
-// "next" is looked up each time.
-assertThrows('fold(sum, 0, remove_next_after(integers_until(10), 5))',
-             TypeError);
-// It is not called at any other time.
+// "next" is looked up only once during the iteration prologue (see
+// https://github.com/tc39/ecma262/pull/988)
+assertEquals(45, fold(sum, 0, remove_next_after(integers_until(10), 5)));
 assertEquals(45,
              fold(sum, 0, remove_next_after(integers_until(10), 10)));
-// It is not looked up too many times.
 assertEquals(45,
              fold(sum, 0, poison_next_after(integers_until(10), 10)));
 

test/mjsunit/es6/spread-call.js

@@ -376,6 +376,11 @@ testSpreadCallsStrict();
   a[3] = 4;
   var called = 0;
 
+  // .next method is only accessed during iteration prologue (see
+  // https://github.com/tc39/ecma262/pull/988)
+  let ArrayIteratorPrototype = Array.prototype[Symbol.iterator]().__proto__;
+  let ArrayIteratorPrototypeNextDescriptor =
+      Object.getOwnPropertyDescriptor(ArrayIteratorPrototype, 'next');
   Object.defineProperty(Array.prototype, 2, {
     get: function() {
       var ai = a[Symbol.iterator]();
@@ -384,7 +389,8 @@ testSpreadCallsStrict();
         get: function() {
           called++;
           return original_next;
-        }
+        },
+        configurable: true
       });
       return 3;
     },
@@ -392,8 +398,10 @@ testSpreadCallsStrict();
   });
 
   assertEquals(10, sum(...a));
-  assertEquals(2, called);
+  assertEquals(0, called);
 
+  Object.defineProperty(ArrayIteratorPrototype, 'next',
+                        ArrayIteratorPrototypeNextDescriptor);
   Object.defineProperty(Array.prototype, 2, {});
 })();
 
@@ -430,9 +438,9 @@ testSpreadCallsStrict();
 
   countArgs(...a);
 
-  // should be called 4 times; 3 for the values, 1 for the final
-  // {value: undefined, done: true} pair
-  assertEquals(4, called);
+  // .next method is only accessed during iteration prologue (see
+  // https://github.com/tc39/ecma262/pull/988)
+  assertEquals(1, called);
 })();
 
 (function testArrayIteratorPrototypeModified() {

test/mjsunit/es6/super-with-spread-modify-next.js

@@ -48,7 +48,9 @@
 
   var r2 = testArgumentsPoint(1, 2);
 
-  assertEquals(3, called);
+  // .next() is only loaded once during the iteration prologue (see
+  // https://github.com/tc39/ecma262/pull/988/ and v8:6861)
+  assertEquals(1, called);
   assertInstanceof(r2, ArgumentsPoint);
   assertInstanceof(r2, Point);
   assertEquals(r2.x, 1);

test/mjsunit/es6/typedarray.js

@@ -341,16 +341,30 @@ function TestTypedArray(constr, elementSize, typicalElement) {
 
   // Modified %ArrayIteratorPrototype%.next() method is honoured (v8:5699)
   const ArrayIteratorPrototype = Object.getPrototypeOf([][Symbol.iterator]());
+  const ArrayIteratorPrototypeNextDescriptor =
+      Object.getOwnPropertyDescriptor(ArrayIteratorPrototype, 'next');
   const ArrayIteratorPrototypeNext = ArrayIteratorPrototype.next;
   ArrayIteratorPrototype.next = function() {
     return { done: true };
   };
   genArr = new constr([1, 2, 3]);
   assertEquals(0, genArr.length);
+
   ArrayIteratorPrototype.next = ArrayIteratorPrototypeNext;
 
-  // Modified %ArrayIteratorPrototype%.next() during iteration is honoured as
-  // well.
+  // Modified %ArrayIteratorPrototype%.next() is only loaded during the iterator
+  // prologue.
+  let nextMethod = ArrayIteratorPrototypeNext;
+  let getNextCount = 0;
+  Object.defineProperty(ArrayIteratorPrototype, 'next', {
+    get() {
+      getNextCount++;
+      return nextMethod;
+    },
+    set(v) { nextMethod = v; },
+    configurable: true
+  });
+
   genArr = new constr(Object.defineProperty([1, , 3], 1, {
     get() {
       ArrayIteratorPrototype.next = function() {
@@ -359,9 +373,13 @@ function TestTypedArray(constr, elementSize, typicalElement) {
       return 2;
     }
   }));
-  assertEquals(2, genArr.length);
+  Object.defineProperty(ArrayIteratorPrototype, 'next',
+                        ArrayIteratorPrototypeNextDescriptor);
+  assertEquals(1, getNextCount);
+  assertEquals(3, genArr.length);
   assertEquals(1, genArr[0]);
   assertEquals(2, genArr[1]);
+  assertEquals(3, genArr[2]);
   ArrayIteratorPrototype.next = ArrayIteratorPrototypeNext;
 }
 

test/test262/test262.status

@@ -423,19 +423,8 @@
   'built-ins/Proxy/ownKeys/return-duplicate-symbol-entries-throws': [FAIL],
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=6861
-  'language/statements/for-of/iterator-next-reference': [FAIL],
-  'language/expressions/async-generator/named-yield-star-async-next': [FAIL],
-  'language/expressions/async-generator/yield-star-async-next': [FAIL],
-  'language/expressions/class/async-gen-method-yield-star-async-next': [FAIL],
-  'language/expressions/class/async-gen-method-static-yield-star-async-next': [FAIL],
-  'language/expressions/object/method-definition/async-gen-yield-star-async-next': [FAIL],
-  'language/statements/async-generator/yield-star-async-next': [FAIL],
-  'language/statements/class/async-gen-method-yield-star-async-next': [FAIL],
-  'language/statements/class/async-gen-method-static-yield-star-async-next': [FAIL],
   'language/expressions/object/method-definition/async-gen-yield-star-sync-next': [FAIL],
   'language/expressions/class/async-gen-method-static-yield-star-sync-next': [FAIL],
-
-  # https://bugs.chromium.org/p/v8/issues/detail?id=6861
   'language/expressions/async-generator/yield-star-sync-next': [FAIL],
   'language/statements/class/async-gen-method-static-yield-star-sync-next': [FAIL],
   'language/expressions/async-generator/named-yield-star-sync-next': [FAIL],