[hydrogen] don't bailout assignments to consts

src/arm/lithium-arm.h

Index: src/arm/lithium-arm.h
diff --git a/src/arm/lithium-arm.h b/src/arm/lithium-arm.h
index 628c3d1a593a83007bf734f58a7c5eaba3cb9680..fff0ffca69a6ba84d654de45e546ef1d1efe45d3 100644
--- a/src/arm/lithium-arm.h
+++ b/src/arm/lithium-arm.h
@@ -1274,6 +1274,7 @@ class LLoadContextSlot: public LTemplateInstruction<1, 1, 0> {
 
   LOperand* context() { return InputAt(0); }
   int slot_index() { return hydrogen()->slot_index(); }
+  bool RequiresHoleCheck() { return hydrogen()->RequiresHoleCheck(); }
 
   virtual void PrintDataTo(StringStream* stream);
 };
@@ -1292,6 +1293,7 @@ class LStoreContextSlot: public LTemplateInstruction<0, 2, 0> {
   LOperand* context() { return InputAt(0); }
   LOperand* value() { return InputAt(1); }
   int slot_index() { return hydrogen()->slot_index(); }
+  bool RequiresHoleCheck() { return hydrogen()->RequiresHoleCheck(); }
 
   virtual void PrintDataTo(StringStream* stream);
 };