[turbofan] Reduce JSLoadProperty and JSStoreProperty of strings to JSLoadNamed and JSStoreNamed.

src/compiler/js-type-feedback.h

 // 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.
 
 #ifndef V8_COMPILER_JS_TYPE_FEEDBACK_H_
 #define V8_COMPILER_JS_TYPE_FEEDBACK_H_
 
 #include "src/utils.h"
 
 #include "src/compiler/graph-reducer.h"
@@ skipping 56 matching lines @@
   Reduction ReduceJSStoreProperty(Node* node);
 
  private:
   JSGraph* jsgraph_;
   SimplifiedOperatorBuilder simplified_;
   JSTypeFeedbackTable* js_type_feedback_;
   TypeFeedbackOracle* oracle_;
 
   TypeFeedbackOracle* oracle() { return oracle_; }
   Graph* graph() { return jsgraph_->graph(); }
+  JSGraph* jsgraph() { return jsgraph_; }
   CommonOperatorBuilder* common() { return jsgraph_->common(); }
   SimplifiedOperatorBuilder* simplified() { return &simplified_; }
 
   void BuildMapCheck(Node* receiver, Handle<Map> map, bool smi_check,
                      Node* effect, Node* control, Node** success, Node** fail);
 
   void GatherReceiverTypes(Node* receiver, Node* effect, TypeFeedbackId id,
                            Handle<Name> property, SmallMapList* maps);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif