[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..e62c3c2ba2fe79d1dd819d6654c42248301e673f 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -1292,6 +1292,7 @@ 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 needs_is_hole_check() { return hydrogen()->needs_is_hole_check(); }
 
   virtual void PrintDataTo(StringStream* stream);
 };