[stubs] replaced ToString MacroAssembler Stub with CodeStubAssembler 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 173 matching lines @@
 }
 
 // static
 Callable CodeFactory::StringToNumber(Isolate* isolate) {
   return Callable(isolate->builtins()->StringToNumber(),
                   TypeConversionDescriptor(isolate));
 }
 
 // static
 Callable CodeFactory::ToString(Isolate* isolate) {
-  ToStringStub stub(isolate);
-  return make_callable(stub);
+  return Callable(isolate->builtins()->ToString(),
+                  TypeConversionDescriptor(isolate));
 }
 
 // static
 Callable CodeFactory::ToName(Isolate* isolate) {
   return Callable(isolate->builtins()->ToName(),
                   TypeConversionDescriptor(isolate));
 }
 
 // static
 Callable CodeFactory::ToInteger(Isolate* isolate) {
@@ skipping 422 matching lines @@
 }
 
 // static
 Callable CodeFactory::InterpreterOnStackReplacement(Isolate* isolate) {
   return Callable(isolate->builtins()->InterpreterOnStackReplacement(),
                   ContextOnlyDescriptor(isolate));
 }
 
 }  // namespace internal
 }  // namespace v8