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

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
index 9d46165ecaf53e3d0f5b89b45aa9fcf76727513b..5de013e27071ddf343cf514dd329e85ec0fc7f2e 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -924,6 +924,8 @@ 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);