[turbofan] Remove RepresentationChanger::simplified field.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/1425643002

Cr-Commit-Position: refs/heads/master@{#31569}

src/compiler/representation-change.h

@@ -21,10 +21,8 @@ namespace compiler {
 // 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) {}
@@ -413,7 +411,6 @@ class RepresentationChanger {
 
  private:
   JSGraph* jsgraph_;
-  SimplifiedOperatorBuilder* simplified_;
   Isolate* isolate_;
 
   friend class RepresentationChangerTester;  // accesses the below fields.
@@ -453,7 +450,7 @@ class RepresentationChanger {
   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(); }
 };
 

src/compiler/simplified-lowering.cc

@@ -1163,8 +1163,7 @@ SimplifiedLowering::SimplifiedLowering(JSGraph* jsgraph, Zone* zone,
 
 
 void SimplifiedLowering::LowerAllNodes() {
-  RepresentationChanger changer(jsgraph(), jsgraph()->simplified(),
-                                jsgraph()->isolate());
+  RepresentationChanger changer(jsgraph(), jsgraph()->isolate());
   RepresentationSelector selector(jsgraph(), zone_, &changer,
                                   source_positions_);
   selector.Run(this);

test/cctest/compiler/test-representation-change.cc

@@ -27,8 +27,8 @@ class RepresentationChangerTester : public HandleAndZoneScope,
       : 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);
   }