Make the typefeedback oracle use a NumberDictionary instead of JSObject as it...

src/type-info.h

 // Copyright 2010 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 242 matching lines @@
   Handle<JSObject> GetPrototypeForPrimitiveCheck(CheckType check);
 
   bool LoadIsBuiltin(Property* expr, Builtins::Name id);
 
   // Get type information for arithmetic operations and compares.
   TypeInfo BinaryType(BinaryOperation* expr);
   TypeInfo CompareType(CompareOperation* expr);
   TypeInfo SwitchType(CaseClause* clause);
 
  private:
-  void Initialize(Handle<Code> code);
-
   ZoneMapList* CollectReceiverTypes(int position,
                                     Handle<String> name,
                                     Code::Flags flags);
 
   void PopulateMap(Handle<Code> code);
 
   void CollectPositions(Code* code,
                         List<int>* code_positions,
                         List<int>* source_positions);
 
+  // Returns an element from the backing store. Returns undefined if
+  // there is no information.
+  Handle<Object> GetInfo(int pos);
+
   Handle<Context> global_context_;
-  Handle<JSObject> map_;
+  Handle<NumberDictionary> dictionary_;
 
   DISALLOW_COPY_AND_ASSIGN(TypeFeedbackOracle);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TYPE_INFO_H_