Avoid usage of temporary MachineOperatorBuilder.

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 "src/base/bits.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node-properties-inl.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,
-                        MachineOperatorBuilder* machine, Isolate* isolate)
+                        Isolate* isolate)
       : jsgraph_(jsgraph),
         simplified_(simplified),
-        machine_(machine),
         isolate_(isolate),
         testing_type_errors_(false),
         type_error_(false) {}
 
   // TODO(titzer): should Word64 also be implicitly convertable to others?
   static const MachineTypeUnion rWord =
       kRepBit | kRepWord8 | kRepWord16 | kRepWord32;
 
   Node* GetRepresentationFor(Node* node, MachineTypeUnion output_type,
                              MachineTypeUnion use_type) {
@@ skipping 264 matching lines @@
     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_;
-  MachineOperatorBuilder* machine_;
   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;
     if (!testing_type_errors_) {
       OStringStream out_str;
       out_str << static_cast<MachineType>(output_type);
 
       OStringStream use_str;
       use_str << static_cast<MachineType>(use);
 
       V8_Fatal(__FILE__, __LINE__,
                "RepresentationChangerError: node #%d:%s of "
                "%s cannot be changed to %s",
                node->id(), node->op()->mnemonic(), out_str.c_str(),
                use_str.c_str());
     }
     return node;
   }
 
   JSGraph* jsgraph() { return jsgraph_; }
   Isolate* isolate() { return isolate_; }
   SimplifiedOperatorBuilder* simplified() { return simplified_; }
-  MachineOperatorBuilder* machine() { return machine_; }
+  MachineOperatorBuilder* machine() { return jsgraph()->machine(); }
 };
 }
 }
 }  // namespace v8::internal::compiler
 
 #endif  // V8_COMPILER_REPRESENTATION_CHANGE_H_