[hydrogen] don't bailout assignments to consts

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index 280d2358c4c243942e42dbf65bc9dcae79353358..93ddfc8b9b4f5cb1a0462cb013b23325f1af7137 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -1273,6 +1273,7 @@ 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, 1> {
   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);
 };