Remove unused function in ia32 code generator

src/ia32/codegen-ia32.h

 // Copyright 2010 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 30 matching lines @@
 
 enum InitState { CONST_INIT, NOT_CONST_INIT };
 enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
 
 
 // -------------------------------------------------------------------------
 // Reference support
 
 // A reference is a C++ stack-allocated object that puts a
 // reference on the virtual frame.  The reference may be consumed
-// by GetValue, TakeValue, SetValue, and Codegen::UnloadReference.
+// by GetValue, TakeValue and SetValue.
 // When the lifetime (scope) of a valid reference ends, it must have
 // been consumed, and be in state UNLOADED.
 class Reference BASE_EMBEDDED {
  public:
   // The values of the types is important, see size().
   enum Type { UNLOADED = -2, ILLEGAL = -1, SLOT = 0, NAMED = 1, KEYED = 2 };
   Reference(CodeGenerator* cgen,
             Expression* expression,
             bool persist_after_get = false);
   ~Reference();
@@ skipping 345 matching lines @@
   void GenerateReturnSequence(Result* return_value);
 
   // Returns the arguments allocation mode.
   ArgumentsAllocationMode ArgumentsMode();
 
   // Store the arguments object and allocate it if necessary.
   Result StoreArgumentsObject(bool initial);
 
   // The following are used by class Reference.
   void LoadReference(Reference* ref);
-  void UnloadReference(Reference* ref);
 
   static Operand ContextOperand(Register context, int index) {
     return Operand(context, Context::SlotOffset(index));
   }
 
   Operand SlotOperand(Slot* slot, Register tmp);
 
   Operand ContextSlotOperandCheckExtensions(Slot* slot,
                                             Result tmp,
                                             JumpTarget* slow);
@@ skipping 667 matching lines @@
     return ObjectBits::encode(object_.code()) |
            AddressBits::encode(addr_.code()) |
            ScratchBits::encode(scratch_.code());
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_CODEGEN_IA32_H_