[builtins] FastNewClosureStub becomes a builtin.

src/interpreter/interpreter.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/interpreter/interpreter.h"
 
 #include <fstream>
 #include <memory>
 
 #include "src/ast/prettyprinter.h"
+#include "src/builtins/builtins-constructor.h"
 #include "src/code-factory.h"
 #include "src/compilation-info.h"
 #include "src/compiler.h"
 #include "src/factory.h"
 #include "src/interpreter/bytecode-flags.h"
 #include "src/interpreter/bytecode-generator.h"
 #include "src/interpreter/bytecodes.h"
 #include "src/interpreter/interpreter-assembler.h"
 #include "src/interpreter/interpreter-intrinsics.h"
 #include "src/log.h"
@@ skipping 2369 matching lines @@
 // constant pool and with the PretenureFlag <tenured>.
 void Interpreter::DoCreateClosure(InterpreterAssembler* assembler) {
   Node* index = __ BytecodeOperandIdx(0);
   Node* shared = __ LoadConstantPoolEntry(index);
   Node* flags = __ BytecodeOperandFlag(1);
   Node* context = __ GetContext();
 
   Label call_runtime(assembler, Label::kDeferred);
   __ GotoUnless(__ IsSetWord32<CreateClosureFlags::FastNewClosureBit>(flags),
                 &call_runtime);
-  __ SetAccumulator(FastNewClosureStub::Generate(assembler, shared, context));
+  ConstructorBuiltinsAssembler constructor_assembler(assembler->state());
+  __ SetAccumulator(constructor_assembler.EmitFastNewClosure(shared, context));
   __ Dispatch();
 
   __ Bind(&call_runtime);
   {
     Node* tenured_raw =
         __ DecodeWordFromWord32<CreateClosureFlags::PretenuredBit>(flags);
     Node* tenured = __ SmiTag(tenured_raw);
     Node* result = __ CallRuntime(Runtime::kInterpreterNewClosure, context,
                                   shared, tenured);
     __ SetAccumulator(result);
@@ skipping 493 matching lines @@
   __ StoreObjectField(generator, JSGeneratorObject::kContinuationOffset,
       __ SmiTag(new_state));
   __ SetAccumulator(old_state);
 
   __ Dispatch();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8