Fix a bug in Lithium environment iteration.

src/lithium-allocator.h

Index: src/lithium-allocator.h
diff --git a/src/lithium-allocator.h b/src/lithium-allocator.h
index d4565587f4ebe4912764ecdf7b4996c6b2dd5363..e4e64974b51e101184e27b4f717968e5029a1cb2 100644
--- a/src/lithium-allocator.h
+++ b/src/lithium-allocator.h
@@ -162,12 +162,12 @@ class LEnvironment;
 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_;
@@ -178,12 +178,12 @@ class TempIterator BASE_EMBEDDED {
 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_;
@@ -193,8 +193,8 @@ class InputIterator BASE_EMBEDDED {
 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: