Use weak cells to embed maps in store handler.

src/ic/handler-compiler.h

 // 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.
 
 #ifndef V8_IC_HANDLER_COMPILER_H_
 #define V8_IC_HANDLER_COMPILER_H_
 
 #include "src/ic/access-compiler.h"
 #include "src/ic/ic-state.h"
 
@@ skipping 212 matching lines @@
   static void GenerateSlow(MacroAssembler* masm);
 
  protected:
   virtual Register FrontendHeader(Register object_reg, Handle<Name> name,
                                   Label* miss);
 
   virtual void FrontendFooter(Handle<Name> name, Label* miss);
   void GenerateRestoreName(Label* label, Handle<Name> name);
 
  private:
-  void GenerateRestoreNameAndMap(Handle<Name> name, Handle<Map> transition);
+  void GenerateRestoreName(Handle<Name> name);
+  void GenerateRestoreMap(Handle<Map> transition, Register scratch,
+                          Label* miss);
 
   void GenerateConstantCheck(Object* constant, Register value_reg,
                              Label* miss_label);
 
   void GenerateFieldTypeChecks(HeapType* field_type, Register value_reg,
                                Label* miss_label);
 
   static Builtins::Name SlowBuiltin(Code::Kind kind) {
     switch (kind) {
       case Code::STORE_IC:
@@ skipping 21 matching lines @@
 
   void CompileElementHandlers(MapHandleList* receiver_maps,
                               CodeHandleList* handlers);
 
   static void GenerateStoreSlow(MacroAssembler* masm);
 };
 }
 }  // namespace v8::internal
 
 #endif  // V8_IC_HANDLER_COMPILER_H_