Remove unused function in ia32 code generator

Review URL: http://codereview.chromium.org/1996006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4614 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ia32/codegen-ia32.cc

@@ -829,14 +829,6 @@ void CodeGenerator::LoadReference(Reference* ref) {
 }
 
 
-void CodeGenerator::UnloadReference(Reference* ref) {
-  // Pop a reference from the stack while preserving TOS.
-  Comment cmnt(masm_, "[ UnloadReference");
-  frame_->Nip(ref->size());
-  ref->set_unloaded();
-}
-
-
 // ECMA-262, section 9.2, page 30: ToBoolean(). Pop the top of stack and
 // convert it to a boolean in the condition code register or jump to
 // 'false_target'/'true_target' as appropriate.

src/ia32/codegen-ia32.h

@@ -48,7 +48,7 @@ enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
 
 // 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 {
@@ -414,7 +414,6 @@ class CodeGenerator: public AstVisitor {
 
   // 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));