[stubs] Remove %_NewObject intrinsic

The last remaining JS user of this in promise.js has recently been moved
to TF. The underlying FastObjectStub is still in use.

BUG=

Review-Url: https://codereview.chromium.org/2598973002
Cr-Commit-Position: refs/heads/master@{#41919}

src/compiler/js-intrinsic-lowering.cc

@@ -72,8 +72,6 @@ Reduction JSIntrinsicLowering::Reduce(Node* node) {
       return ReduceToString(node);
     case Runtime::kInlineCall:
       return ReduceCall(node);
-    case Runtime::kInlineNewObject:
-      return ReduceNewObject(node);
     case Runtime::kInlineGetSuperConstructor:
       return ReduceGetSuperConstructor(node);
     default:
@@ -288,10 +286,6 @@ Reduction JSIntrinsicLowering::ReduceCall(Node* node) {
   return Changed(node);
 }
 
-Reduction JSIntrinsicLowering::ReduceNewObject(Node* node) {
-  return Change(node, CodeFactory::FastNewObject(isolate()), 0);
-}
-
 Reduction JSIntrinsicLowering::ReduceGetSuperConstructor(Node* node) {
   Node* active_function = NodeProperties::GetValueInput(node, 0);
   Node* effect = NodeProperties::GetEffectInput(node);

src/compiler/js-intrinsic-lowering.h

@@ -58,7 +58,6 @@ class V8_EXPORT_PRIVATE JSIntrinsicLowering final
   Reduction ReduceToObject(Node* node);
   Reduction ReduceToString(Node* node);
   Reduction ReduceCall(Node* node);
-  Reduction ReduceNewObject(Node* node);
   Reduction ReduceGetSuperConstructor(Node* node);
 
   Reduction Change(Node* node, const Operator* op);

src/crankshaft/hydrogen.cc

@@ -12101,19 +12101,6 @@ void HOptimizedGraphBuilder::GenerateSubString(CallRuntime* call) {
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
-// Support for direct creation of new objects.
-void HOptimizedGraphBuilder::GenerateNewObject(CallRuntime* call) {
-  DCHECK_EQ(2, call->arguments()->length());
-  CHECK_ALIVE(VisitExpressions(call->arguments()));
-  FastNewObjectStub stub(isolate());
-  FastNewObjectDescriptor descriptor(isolate());
-  HValue* values[] = {Pop(), Pop()};
-  HConstant* stub_value = Add<HConstant>(stub.GetCode());
-  HInstruction* result =
-      New<HCallWithDescriptor>(stub_value, 0, descriptor, ArrayVector(values));
-  return ast_context()->ReturnInstruction(result, call->id());
-}
-
 // Support for direct calls from JavaScript to native RegExp code.
 void HOptimizedGraphBuilder::GenerateRegExpExec(CallRuntime* call) {
   DCHECK_EQ(4, call->arguments()->length());

src/crankshaft/hydrogen.h

@@ -2159,7 +2159,6 @@ class HOptimizedGraphBuilder : public HGraphBuilder,
   F(IsRegExp)                          \
   F(IsJSProxy)                         \
   F(Call)                              \
-  F(NewObject)                         \
   F(ToInteger)                         \
   F(ToObject)                          \
   F(ToString)                          \

src/full-codegen/full-codegen.cc

@@ -606,10 +606,6 @@ void FullCodeGenerator::EmitIntrinsicAsStubCall(CallRuntime* expr,
   context()->Plug(result_register());
 }
 
-void FullCodeGenerator::EmitNewObject(CallRuntime* expr) {
-  EmitIntrinsicAsStubCall(expr, CodeFactory::FastNewObject(isolate()));
-}
-
 void FullCodeGenerator::EmitNumberToString(CallRuntime* expr) {
   EmitIntrinsicAsStubCall(expr, CodeFactory::NumberToString(isolate()));
 }

src/full-codegen/full-codegen.h

@@ -405,7 +405,6 @@ class FullCodeGenerator final : public AstVisitor<FullCodeGenerator> {
   F(IsRegExp)                           \
   F(IsJSProxy)                          \
   F(Call)                               \
-  F(NewObject)                          \
   F(IsJSReceiver)                       \
   F(GetSuperConstructor)                \
   F(DebugBreakInOptimizedCode)          \

src/interpreter/interpreter-intrinsics.cc

@@ -240,11 +240,6 @@ Node* IntrinsicsHelper::HasProperty(Node* input, Node* arg_count,
                              CodeFactory::HasProperty(isolate()));
 }
 
-Node* IntrinsicsHelper::NewObject(Node* input, Node* arg_count, Node* context) {
-  return IntrinsicAsStubCall(input, context,
-                             CodeFactory::FastNewObject(isolate()));
-}
-
 Node* IntrinsicsHelper::NumberToString(Node* input, Node* arg_count,
                                        Node* context) {
   return IntrinsicAsStubCall(input, context,

src/interpreter/interpreter-intrinsics.h

@@ -33,7 +33,6 @@ namespace interpreter {
   V(IsRegExp, is_regexp, 1)                             \
   V(IsSmi, is_smi, 1)                                   \
   V(IsTypedArray, is_typed_array, 1)                    \
-  V(NewObject, new_object, 2)                           \
   V(NumberToString, number_to_string, 1)                \
   V(RegExpExec, reg_exp_exec, 4)                        \
   V(SubString, sub_string, 3)                           \