Use existing global cell status as a hint when generating loads.

src/ic.h

 // Copyright 2006-2009 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 282 matching lines @@
   static Code* pre_monomorphic_stub() {
     return Builtins::builtin(Builtins::LoadIC_PreMonomorphic);
   }
 
   static void Clear(Address address, Code* target);
 
   static bool PatchInlinedLoad(Address address, Object* map, int index);
 
   static bool PatchInlinedContextualLoad(Address address,
                                          Object* map,
-                                         Object* cell);
+                                         Object* cell,
+                                         bool is_dont_delete);
 
   friend class IC;
 };
 
 
 class KeyedLoadIC: public IC {
  public:
   KeyedLoadIC() : IC(NO_EXTRA_FRAME) { ASSERT(target()->is_keyed_load_stub()); }
 
   Object* Load(State state, Handle<Object> object, Handle<Object> key);
@@ skipping 196 matching lines @@
   static const char* GetName(TypeInfo type_info);
 
   static State ToState(TypeInfo type_info);
 
   static TypeInfo GetTypeInfo(Object* left, Object* right);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_IC_H_