Load callback data from weak cell instead of embedding it in handler.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index e686debeea6596b89bfde6066121333216f5b8ae..e62c7d8b4d23d6013b0cddda89db67be31c96773 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -298,6 +298,8 @@ class MacroAssembler: public Assembler {
   // Compare the given value and the value of weak cell.
   void CmpWeakValue(Register value, Handle<WeakCell> cell, Register scratch);
 
+  void GetWeakValue(Register value, Handle<WeakCell> cell);
+
   // Load the value of the weak cell in the value register. Branch to the given
   // miss label if the weak cell was cleared.
   void LoadWeakValue(Register value, Handle<WeakCell> cell, Label* miss);