Additional work to get array literal allocation tracking working, even with --always-opt

src/codegen.h

Index: src/codegen.h
diff --git a/src/codegen.h b/src/codegen.h
index 0ac68c2eac7c52bf493b93de0c0bac4e722f6378..adcac14ecd5532deb2b1739e03e6939a33b059f4 100644
--- a/src/codegen.h
+++ b/src/codegen.h
@@ -96,7 +96,9 @@ UnaryMathFunction CreateSqrtFunction();
 
 class ElementsTransitionGenerator : public AllStatic {
  public:
-  static void GenerateMapChangeElementsTransition(MacroAssembler* masm);
+  // If fail is not null, then allocation site info checking is enabled
+  static void GenerateMapChangeElementsTransition(MacroAssembler* masm,
+                                                  Label* fail = NULL);

[danno, 2013/01/10 22:58:59]

Maybe it makes sense to not provide a default value for fail (which should be
called allocation_site_info_found), it forces callees to consciously decide
(forgetting the parameter could cause subtle bugs).

[mvstanton, 2013/01/11 13:43:01]

Done.

   static void GenerateSmiToDouble(MacroAssembler* masm, Label* fail);
   static void GenerateDoubleToObject(MacroAssembler* masm, Label* fail);