Added dictionary that can use objects as keys.

src/handles.h

 // Copyright 2011 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 250 matching lines @@
 
 Handle<Object> GetPrototype(Handle<Object> obj);
 
 Handle<Object> SetPrototype(Handle<JSObject> obj, Handle<Object> value);
 
 // Return the object's hidden properties object. If the object has no hidden
 // properties and create_if_needed is true, then a new hidden property object
 // will be allocated. Otherwise the Heap::undefined_value is returned.
 Handle<Object> GetHiddenProperties(Handle<JSObject> obj, bool create_if_needed);
 
+Handle<Smi> GetIdentityHash(Handle<JSObject> obj);
+
 Handle<Object> DeleteElement(Handle<JSObject> obj, uint32_t index);
 Handle<Object> DeleteProperty(Handle<JSObject> obj, Handle<String> prop);
 
 Handle<Object> LookupSingleCharacterStringFromCode(uint32_t index);
 
 Handle<JSObject> Copy(Handle<JSObject> obj);
 
 Handle<Object> SetAccessor(Handle<JSObject> obj, Handle<AccessorInfo> info);
 
 Handle<FixedArray> AddKeysFromJSArray(Handle<FixedArray>,
@@ skipping 89 matching lines @@
   inline NoHandleAllocation();
   inline ~NoHandleAllocation();
  private:
   int level_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HANDLES_H_