Implement tracking and optimizations of packed arrays

src/codegen.h

Index: src/codegen.h
diff --git a/src/codegen.h b/src/codegen.h
index 50d70f265db4478e37fc57a9495b0cecd3ea1995..c1be9aac5fa6203343b47c7dc291a575883bb14c 100644
--- a/src/codegen.h
+++ b/src/codegen.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 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:
@@ -95,7 +95,7 @@ UnaryMathFunction CreateSqrtFunction();
 
 class ElementsTransitionGenerator : public AllStatic {
  public:
-  static void GenerateSmiOnlyToObject(MacroAssembler* masm);
+  static void GenerateMapChangeElementTransition(MacroAssembler* masm);
   static void GenerateSmiOnlyToDouble(MacroAssembler* masm, Label* fail);
   static void GenerateDoubleToObject(MacroAssembler* masm, Label* fail);