[turbofan] Remove RepresentationChanger::simplified field.

src/compiler/representation-change.h

 // 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.
 
 #ifndef V8_COMPILER_REPRESENTATION_CHANGE_H_
 #define V8_COMPILER_REPRESENTATION_CHANGE_H_
 
 #include <sstream>
 
 #include "src/base/bits.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/simplified-operator.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // Contains logic related to changing the representation of values for constants
 // and other nodes, as well as lowering Simplified->Machine operators.
 // Eagerly folds any representation changes for constants.
 class RepresentationChanger {
  public:
-  RepresentationChanger(JSGraph* jsgraph, SimplifiedOperatorBuilder* simplified,
-                        Isolate* isolate)
+  RepresentationChanger(JSGraph* jsgraph, Isolate* isolate)
       : jsgraph_(jsgraph),
-        simplified_(simplified),
         isolate_(isolate),
         testing_type_errors_(false),
         type_error_(false) {}
 
   // TODO(titzer): should Word64 also be implicitly convertable to others?
   static bool IsWord(MachineTypeUnion type) {
     return (type & (kRepWord8 | kRepWord16 | kRepWord32)) != 0;
   }
 
   Node* GetRepresentationFor(Node* node, MachineTypeUnion output_type,
@@ skipping 368 matching lines @@
       return kTypeAny;  // TODO(titzer): should be an error
     if (type->Is(Type::Signed32())) return kTypeInt32;
     if (type->Is(Type::Unsigned32())) return kTypeUint32;
     if (type->Is(Type::Number())) return kTypeNumber;
     if (type->Is(Type::Boolean())) return kTypeBool;
     return kTypeAny;
   }
 
  private:
   JSGraph* jsgraph_;
-  SimplifiedOperatorBuilder* simplified_;
   Isolate* isolate_;
 
   friend class RepresentationChangerTester;  // accesses the below fields.
 
   bool testing_type_errors_;  // If {true}, don't abort on a type error.
   bool type_error_;           // Set when a type error is detected.
 
   Node* TypeError(Node* node, MachineTypeUnion output_type,
                   MachineTypeUnion use) {
     type_error_ = true;
@@ skipping 19 matching lines @@
   }
 
   Node* InsertChangeTaggedToFloat64(Node* node) {
     return jsgraph()->graph()->NewNode(simplified()->ChangeTaggedToFloat64(),
                                        node);
   }
 
   JSGraph* jsgraph() const { return jsgraph_; }
   Isolate* isolate() const { return isolate_; }
   Factory* factory() const { return isolate()->factory(); }
-  SimplifiedOperatorBuilder* simplified() { return simplified_; }
+  SimplifiedOperatorBuilder* simplified() { return jsgraph()->simplified(); }
   MachineOperatorBuilder* machine() { return jsgraph()->machine(); }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_REPRESENTATION_CHANGE_H_