Re-enable using push instructions for syncing the virtual frame....

src/ia32/codegen-ia32.h

Index: src/ia32/codegen-ia32.h
===================================================================
--- src/ia32/codegen-ia32.h	(revision 3311)
+++ src/ia32/codegen-ia32.h	(working copy)
@@ -468,9 +468,11 @@
   // than 16 bits.
   static const int kMaxSmiInlinedBits = 16;
   bool IsUnsafeSmi(Handle<Object> value);
-  // Load an integer constant x into a register target using
+  // Load an integer constant x into a register target or into the stack using
   // at most 16 bits of user-controlled data per assembly operation.
-  void LoadUnsafeSmi(Register target, Handle<Object> value);
+  void MoveUnsafeSmi(Register target, Handle<Object> value);
+  void StoreUnsafeSmiToLocal(int offset, Handle<Object> value);
+  void PushUnsafeSmi(Handle<Object> value);
 
   void CallWithArguments(ZoneList<Expression*>* arguments, int position);