[turbofan] Remove locally constructed simplified builders.

test/cctest/compiler/test-simplified-lowering.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/compiler/access-builder.h"
 #include "src/compiler/change-lowering.h"
 #include "src/compiler/control-builders.h"
 #include "src/compiler/graph-reducer.h"
@@ skipping 20 matching lines @@
 
 template <typename ReturnType>
 class SimplifiedLoweringTester : public GraphBuilderTester<ReturnType> {
  public:
   SimplifiedLoweringTester(MachineType p0 = kMachNone,
                            MachineType p1 = kMachNone)
       : GraphBuilderTester<ReturnType>(p0, p1),
         typer(this->isolate(), this->graph()),
         javascript(this->zone()),
         jsgraph(this->isolate(), this->graph(), this->common(), &javascript,
-                nullptr, this->machine()),
+                this->simplified(), this->machine()),
         source_positions(jsgraph.graph()),
         lowering(&jsgraph, this->zone(), &source_positions) {}
 
   Typer typer;
   JSOperatorBuilder javascript;
   JSGraph jsgraph;
   SourcePositionTable source_positions;
   SimplifiedLowering lowering;
 
   void LowerAllNodes() {
@@ skipping 617 matching lines @@
   Node* p2;
   Node* start;
   Node* end;
   Node* ret;
 
   explicit TestingGraph(Type* p0_type, Type* p1_type = Type::None(),
                         Type* p2_type = Type::None())
       : GraphAndBuilders(main_zone()),
         typer(main_isolate(), graph()),
         javascript(main_zone()),
-        jsgraph(main_isolate(), graph(), common(), &javascript, nullptr,
+        jsgraph(main_isolate(), graph(), common(), &javascript, simplified(),
                 machine()) {
     start = graph()->NewNode(common()->Start(2));
     graph()->SetStart(start);
     ret =
         graph()->NewNode(common()->Return(), jsgraph.Constant(0), start, start);
     end = graph()->NewNode(common()->End(1), ret);
     graph()->SetEnd(end);
     p0 = graph()->NewNode(common()->Parameter(0), start);
     p1 = graph()->NewNode(common()->Parameter(1), start);
     p2 = graph()->NewNode(common()->Parameter(2), start);
@@ skipping 1306 matching lines @@
     Type* phi_type = Type::Union(d.arg1, d.arg2, z);
     NodeProperties::SetType(phi, phi_type);
 
     Node* use = t.Use(phi, d.use);
     t.Return(use);
     t.Lower();
 
     CHECK_EQ(d.expected, OpParameter<MachineType>(phi));
   }
 }