Fix a bug in Lithium environment iteration.

src/lithium-allocator.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 144 matching lines @@
 // A register-allocator view of a Lithium instruction. It contains the id of
 // the output operand and a list of input operand uses.
 
 class LInstruction;
 class LEnvironment;
 
 // Iterator for non-null temp operands.
 class TempIterator BASE_EMBEDDED {
  public:
   inline explicit TempIterator(LInstruction* instr);
-  inline bool HasNext();
-  inline LOperand* Next();
+  inline bool Done();
+  inline LOperand* Current();
   inline void Advance();
 
  private:
-  inline int AdvanceToNext(int start);
+  inline void SkipUninteresting();
   LInstruction* instr_;
   int limit_;
   int current_;
 };
 
 
 // Iterator for non-constant input operands.
 class InputIterator BASE_EMBEDDED {
  public:
   inline explicit InputIterator(LInstruction* instr);
-  inline bool HasNext();
-  inline LOperand* Next();
+  inline bool Done();
+  inline LOperand* Current();
   inline void Advance();
 
  private:
-  inline int AdvanceToNext(int start);
+  inline void SkipUninteresting();
   LInstruction* instr_;
   int limit_;
   int current_;
 };
 
 
 class UseIterator BASE_EMBEDDED {
  public:
   inline explicit UseIterator(LInstruction* instr);
-  inline bool HasNext();
-  inline LOperand* Next();
+  inline bool Done();
+  inline LOperand* Current();
   inline void Advance();
 
  private:
   InputIterator input_iterator_;
   DeepIterator env_iterator_;
 };
 
 
 // Representation of the non-empty interval [start,end[.
 class UseInterval: public ZoneObject {
@@ skipping 413 matching lines @@
 
   bool has_osr_entry_;
 
   DISALLOW_COPY_AND_ASSIGN(LAllocator);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LITHIUM_ALLOCATOR_H_