[interpreter] Add BytecodeGenerator::Abort().

Add a method to emit abort for code which should
not be reachable.

BUG=v8:4280
LOG=N

Review-Url: https://codereview.chromium.org/2002833005
Cr-Commit-Position: refs/heads/master@{#36438}

src/interpreter/bytecode-generator.cc

@@ -657,13 +657,7 @@ void BytecodeGenerator::BuildIndexedJump(Register index, size_t start_index,
         .JumpIfTrue(&(targets[i]));
   }
 
-  RegisterAllocationScope register_scope(this);
-  Register reason = register_allocator()->NewRegister();
-  BailoutReason bailout_reason = BailoutReason::kInvalidJumpTableIndex;
-  builder()
-      ->LoadLiteral(Smi::FromInt(static_cast<int>(bailout_reason)))
-      .StoreAccumulatorInRegister(reason)
-      .CallRuntime(Runtime::kAbort, reason, 1);
+  BuildAbort(BailoutReason::kInvalidJumpTableIndex);
 }
 
 void BytecodeGenerator::VisitIterationHeader(IterationStatement* stmt,
@@ -1959,6 +1953,15 @@ void BytecodeGenerator::BuildKeyedSuperPropertyStore(Register receiver,
   builder()->CallRuntime(function_id, receiver, 4);
 }
 
+void BytecodeGenerator::BuildAbort(BailoutReason bailout_reason) {
+  RegisterAllocationScope register_scope(this);
+  Register reason = register_allocator()->NewRegister();
+  builder()
+      ->LoadLiteral(Smi::FromInt(static_cast<int>(bailout_reason)))
+      .StoreAccumulatorInRegister(reason)
+      .CallRuntime(Runtime::kAbort, reason, 1);
+}
+
 void BytecodeGenerator::BuildThrowReferenceError(Handle<String> name) {
   RegisterAllocationScope register_scope(this);
   Register name_reg = register_allocator()->NewRegister();

src/interpreter/bytecode-generator.h

@@ -105,6 +105,7 @@ class BytecodeGenerator final : public AstVisitor {
   void BuildKeyedSuperPropertyLoad(Register receiver, Register home_object,
                                    Register key);
 
+  void BuildAbort(BailoutReason bailout_reason);
   void BuildThrowIfHole(Handle<String> name);
   void BuildThrowIfNotHole(Handle<String> name);
   void BuildThrowReassignConstant(Handle<String> name);