Make embedded maps in optimized code weak.

src/lithium.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 678 matching lines @@
       : spill_slot_count_(0),
         info_(info),
         graph_(graph),
         instructions_(32, graph->zone()),
         pointer_maps_(8, graph->zone()),
         inlined_closures_(1, graph->zone()) { }
 
   int spill_slot_count_;
 
  private:
+  void RegisterDependentCodeForEmbeddedMaps(Handle<Code> code);
   CompilationInfo* info_;
   HGraph* const graph_;
   ZoneList<LInstruction*> instructions_;
   ZoneList<LPointerMap*> pointer_maps_;
   ZoneList<Handle<JSFunction> > inlined_closures_;
 };
 
 
 int ElementsKindToShiftSize(ElementsKind elements_kind);
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LITHIUM_H_