Fix worst-case behavior of MergeRemovableSimulates().

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 1812 matching lines @@
   void AddPushedValue(HValue* value) {
     AddValue(kNoIndex, value);
   }
   virtual int OperandCount() { return values_.length(); }
   virtual HValue* OperandAt(int index) const { return values_[index]; }
 
   virtual Representation RequiredInputRepresentation(int index) {
     return Representation::None();
   }
 
-  void MergeInto(HSimulate* other);
+  void MergeWith(ZoneList<HSimulate*>* list);
   bool is_candidate_for_removal() { return removable_ == REMOVABLE_SIMULATE; }
 
   DECLARE_CONCRETE_INSTRUCTION(Simulate)
 
 #ifdef DEBUG
   virtual void Verify();
 #endif
 
  protected:
   virtual void InternalSetOperandAt(int index, HValue* value) {
@@ skipping 4605 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_