[turbofan] Remove locally constructed simplified builders.

src/compiler/js-type-feedback-lowering.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_LOWERING_H_
 #define V8_COMPILER_JS_TYPE_FEEDBACK_LOWERING_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/graph-reducer.h"
-#include "src/compiler/simplified-operator.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class Factory;
 
 namespace compiler {
 
 // Forward declarations.
 class CommonOperatorBuilder;
 class JSGraph;
 class MachineOperatorBuilder;
+class SimplifiedOperatorBuilder;
 
 
 // Lowers JS-level operators to simplified operators based on type feedback.
 class JSTypeFeedbackLowering final : public AdvancedReducer {
  public:
   // Various configuration flags to control the operation of this lowering.
   enum Flag {
     kNoFlags = 0,
     kDeoptimizationEnabled = 1 << 0,
   };
   typedef base::Flags<Flag> Flags;
 
   JSTypeFeedbackLowering(Editor* editor, Flags flags, JSGraph* jsgraph);
   ~JSTypeFeedbackLowering() final {}
 
   Reduction Reduce(Node* node) final;
 
  private:
   Reduction ReduceJSLoadNamed(Node* node);
 
   Factory* factory() const;
   Flags flags() const { return flags_; }
   Graph* graph() const;
   Isolate* isolate() const;
   JSGraph* jsgraph() const { return jsgraph_; }
   CommonOperatorBuilder* common() const;
   MachineOperatorBuilder* machine() const;
-  SimplifiedOperatorBuilder* simplified() { return &simplified_; }
+  SimplifiedOperatorBuilder* simplified() const;
 
   Flags const flags_;
   JSGraph* const jsgraph_;
-  SimplifiedOperatorBuilder simplified_;
 
   DISALLOW_COPY_AND_ASSIGN(JSTypeFeedbackLowering);
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(JSTypeFeedbackLowering::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_TYPE_FEEDBACK_LOWERING_H_