[ic] Encode [Keyed]StoreIC's language mode in slot kind instead of code object's flags.

src/compiler/js-native-context-specialization.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/js-native-context-specialization.h"
 
 #include "src/accessors.h"
 #include "src/code-factory.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
@@ skipping 1529 matching lines @@
                                 value, effect, control);
       if (access_info.HasTransitionMap()) {
         effect = graph()->NewNode(common()->FinishRegion(),
                                   jsgraph()->UndefinedConstant(), effect);
       }
     }
   } else {
     DCHECK(access_info.IsGeneric());
     DCHECK_EQ(AccessMode::kStore, access_mode);
     DCHECK(vector->IsStoreIC(slot));
+    DCHECK_EQ(vector->GetLanguageMode(slot), language_mode);
     Callable callable =
         CodeFactory::StoreICInOptimizedCode(isolate(), language_mode);
     const CallInterfaceDescriptor& descriptor = callable.descriptor();
     CallDescriptor* desc = Linkage::GetStubCallDescriptor(
         isolate(), graph()->zone(), descriptor,
         descriptor.GetStackParameterCount(), CallDescriptor::kNeedsFrameState,
         Operator::kNoProperties);
     Node* stub_code = jsgraph()->HeapConstant(callable.code());
     Node* name_node = jsgraph()->HeapConstant(name);
     Node* slot_node = jsgraph()->Constant(vector->GetIndex(slot));
@@ skipping 686 matching lines @@
   return jsgraph()->javascript();
 }
 
 SimplifiedOperatorBuilder* JSNativeContextSpecialization::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8