Fix a bug in %_GetCachedArrayIndex.

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 2744 matching lines @@
  public:
   explicit HHasCachedArrayIndex(HValue* value) : HUnaryPredicate(value) { }
 
   DECLARE_CONCRETE_INSTRUCTION(HasCachedArrayIndex)
 
  protected:
   virtual bool DataEquals(HValue* other) { return true; }
 };
 
 
-class HGetCachedArrayIndex: public HUnaryPredicate {
+class HGetCachedArrayIndex: public HUnaryOperation {
  public:
-  explicit HGetCachedArrayIndex(HValue* value) : HUnaryPredicate(value) { }
+  explicit HGetCachedArrayIndex(HValue* value) : HUnaryOperation(value) {
+    set_representation(Representation::Tagged());
+    SetFlag(kUseGVN);
+  }
+
+  virtual Representation RequiredInputRepresentation(int index) const {
+    return Representation::Tagged();
+  }
 
   DECLARE_CONCRETE_INSTRUCTION(GetCachedArrayIndex)
 
  protected:
   virtual bool DataEquals(HValue* other) { return true; }
 };
 
 
 class HClassOfTest: public HUnaryPredicate {
  public:
@@ skipping 1301 matching lines @@
 
   DECLARE_CONCRETE_INSTRUCTION(In)
 };
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_