[turbofan] Remove RepresentationChanger::simplified field.

test/cctest/compiler/test-representation-change.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 <limits>
 
 #include "src/v8.h"
 #include "test/cctest/cctest.h"
 #include "test/cctest/compiler/codegen-tester.h"
 #include "test/cctest/compiler/graph-builder-tester.h"
 #include "test/cctest/compiler/value-helper.h"
 
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/representation-change.h"
 
 using namespace v8::internal;
 using namespace v8::internal::compiler;
 
 namespace v8 {  // for friendiness.
 namespace internal {
 namespace compiler {
 
 class RepresentationChangerTester : public HandleAndZoneScope,
                                     public GraphAndBuilders {
  public:
   explicit RepresentationChangerTester(int num_parameters = 0)
       : GraphAndBuilders(main_zone()),
         javascript_(main_zone()),
         jsgraph_(main_isolate(), main_graph_, &main_common_, &javascript_,
-                 nullptr, &main_machine_),
-        changer_(&jsgraph_, &main_simplified_, main_isolate()) {
+                 &main_simplified_, &main_machine_),
+        changer_(&jsgraph_, main_isolate()) {
     Node* s = graph()->NewNode(common()->Start(num_parameters));
     graph()->SetStart(s);
   }
 
   JSOperatorBuilder javascript_;
   JSGraph jsgraph_;
   RepresentationChanger changer_;
 
   Isolate* isolate() { return main_isolate(); }
   Graph* graph() { return main_graph_; }
@@ skipping 502 matching lines @@
   r.CheckTypeError(kRepWord32 | kTypeUint32, kRepWord64);
 
   for (size_t i = 0; i < arraysize(all_reps); i++) {
     for (size_t j = 0; j < arraysize(all_reps); j++) {
       if (i == j) continue;
       // Only a single from representation is allowed.
       r.CheckTypeError(all_reps[i] | all_reps[j], kRepTagged);
     }
   }
 }