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

src/compiler/js-generic-lowering.cc

 // Copyright 2014 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-generic-lowering.h"
 
 #include "src/ast/ast.h"
 #include "src/builtins/builtins-constructor.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 186 matching lines @@
   ReplaceWithStubCall(node, callable, flags);
 }
 
 
 void JSGenericLowering::LowerJSStoreProperty(Node* node) {
   Node* receiver = NodeProperties::GetValueInput(node, 0);
   Node* key = NodeProperties::GetValueInput(node, 1);
   Node* value = NodeProperties::GetValueInput(node, 2);
   CallDescriptor::Flags flags = FrameStateFlagForCall(node);
   PropertyAccess const& p = PropertyAccessOf(node->op());
-  LanguageMode language_mode = p.language_mode();
   Callable callable =
-      CodeFactory::KeyedStoreICInOptimizedCode(isolate(), language_mode);
+      CodeFactory::KeyedStoreICInOptimizedCode(isolate(), p.language_mode());
   Node* vector = jsgraph()->HeapConstant(p.feedback().vector());
   typedef StoreWithVectorDescriptor Descriptor;
   node->InsertInputs(zone(), 0, 2);
   node->ReplaceInput(Descriptor::kReceiver, receiver);
   node->ReplaceInput(Descriptor::kName, key);
   node->ReplaceInput(Descriptor::kValue, value);
   node->ReplaceInput(Descriptor::kSlot,
                      jsgraph()->SmiConstant(p.feedback().index()));
   node->ReplaceInput(Descriptor::kVector, vector);
   ReplaceWithStubCall(node, callable, flags);
@@ skipping 466 matching lines @@
 }
 
 
 MachineOperatorBuilder* JSGenericLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8