Turn the NumberToStringStub into a hydrogen stub.

src/code-stubs.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 446 matching lines @@
   virtual void InitializeInterfaceDescriptor(
       Isolate* isolate,
       CodeStubInterfaceDescriptor* descriptor);
 
  private:
   Major MajorKey() { return ToNumber; }
   int NotMissMinorKey() { return 0; }
 };
 
 
+class NumberToStringStub V8_FINAL : public HydrogenCodeStub {
+ public:
+  NumberToStringStub() {}
+
+  virtual Handle<Code> GenerateCode(Isolate* isolate) V8_OVERRIDE;
+
+  virtual void InitializeInterfaceDescriptor(
+      Isolate* isolate,
+      CodeStubInterfaceDescriptor* descriptor) V8_OVERRIDE;
+
+  // Parameters accessed via CodeStubGraphBuilder::GetParameter()
+  static const int kNumber = 0;
+
+ private:
+  virtual Major MajorKey() V8_OVERRIDE { return NumberToString; }
+  virtual int NotMissMinorKey() V8_OVERRIDE { return 0; }
+};
+
+
 class FastNewClosureStub : public HydrogenCodeStub {
  public:
   explicit FastNewClosureStub(LanguageMode language_mode, bool is_generator)
     : language_mode_(language_mode),
       is_generator_(is_generator) { }
 
   virtual Handle<Code> GenerateCode(Isolate* isolate);
 
   virtual void InitializeInterfaceDescriptor(
       Isolate* isolate,
@@ skipping 1823 matching lines @@
   int MinorKey() { return 0; }
 
   void Generate(MacroAssembler* masm);
 
   DISALLOW_COPY_AND_ASSIGN(ProfileEntryHookStub);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_