[builtins] FastNewFunctionContextStub becomes a builtin

src/code-factory.cc

 // Copyright 2014 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/code-factory.h"
 
 #include "src/bootstrapper.h"
 #include "src/ic/ic.h"
 
 namespace v8 {
@@ skipping 353 matching lines @@
 // static
 Callable CodeFactory::FastCloneShallowObject(Isolate* isolate, int length) {
   FastCloneShallowObjectStub stub(isolate, length);
   return make_callable(stub);
 }
 
 
 // static
 Callable CodeFactory::FastNewFunctionContext(Isolate* isolate,
                                              ScopeType scope_type) {
-  FastNewFunctionContextStub stub(isolate, scope_type);
-  return make_callable(stub);
+  return Callable(isolate->builtins()->NewFunctionContext(scope_type),
+                  FastNewFunctionContextDescriptor(isolate));
 }
 
 // static
 Callable CodeFactory::FastNewClosure(Isolate* isolate) {
   return Callable(isolate->builtins()->FastNewClosure(),
                   FastNewClosureDescriptor(isolate));
 }
 
 // static
 Callable CodeFactory::FastNewObject(Isolate* isolate) {
@@ skipping 128 matching lines @@
 }
 
 // static
 Callable CodeFactory::FunctionPrototypeBind(Isolate* isolate) {
   return Callable(isolate->builtins()->FunctionPrototypeBind(),
                   BuiltinDescriptor(isolate));
 }
 
 }  // namespace internal
 }  // namespace v8