Fix an assertion failure in stack trace construction.

src/hydrogen-instructions.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 1684 matching lines @@
   virtual Range* InferRange();
   virtual Representation RequiredInputRepresentation(int index) const {
     return representation();
   }
   virtual HType CalculateInferredType() const;
   virtual int OperandCount() const { return inputs_.length(); }
   virtual HValue* OperandAt(int index) const { return inputs_[index]; }
   HValue* GetRedundantReplacement() const;
   void AddInput(HValue* value);
 
-  bool HasReceiverOperand();
+  bool IsReceiver() { return merged_index_ == 0; }
 
   int merged_index() const { return merged_index_; }
 
   virtual const char* Mnemonic() const { return "phi"; }
 
   virtual void PrintTo(StringStream* stream) const;
 
 #ifdef DEBUG
   virtual void Verify();
 #endif
@@ skipping 1478 matching lines @@
   HValue* object() const { return left(); }
   HValue* key() const { return right(); }
 };
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_