Regression fix: HForceRepresentation shouldn't be an idef.

src/hydrogen-instructions.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 1561 matching lines @@
       BitVector* visited) V8_OVERRIDE;
 
   virtual Representation RequiredInputRepresentation(int index) V8_OVERRIDE {
     return representation();  // Same as the output representation.
   }
 
   virtual void PrintDataTo(StringStream* stream) V8_OVERRIDE;
 
   DECLARE_CONCRETE_INSTRUCTION(ForceRepresentation)
 
- protected:
-  virtual int RedefinedOperandIndex() { return 0; }
-
  private:
   HForceRepresentation(HValue* value, Representation required_representation) {
     SetOperandAt(0, value);
     set_representation(required_representation);
   }
 };
 
 
 class HChange V8_FINAL : public HUnaryOperation {
  public:
@@ skipping 5705 matching lines @@
   virtual bool IsDeletable() const V8_OVERRIDE { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_