[turbofan] Remove locally constructed simplified builders.

test/unittests/compiler/js-type-feedback-unittest.cc

 // Copyright 2015 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 "src/compiler.h"
 
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/js-type-feedback.h"
@@ skipping 22 matching lines @@
         dependencies_(isolate(), zone()) {}
   ~JSTypeFeedbackTest() override { dependencies_.Rollback(); }
 
  protected:
   Reduction Reduce(Node* node,
                    JSTypeFeedbackSpecializer::DeoptimizationMode mode) {
     Handle<GlobalObject> global_object(
         isolate()->native_context()->global_object(), isolate());
 
     MachineOperatorBuilder machine(zone());
-    JSGraph jsgraph(isolate(), graph(), common(), javascript(), nullptr,
+    SimplifiedOperatorBuilder simplified(zone());
+    JSGraph jsgraph(isolate(), graph(), common(), javascript(), &simplified,
                     &machine);
     JSTypeFeedbackTable table(zone());
     // TODO(titzer): mock the GraphReducer here for better unit testing.
     GraphReducer graph_reducer(zone(), graph());
     JSTypeFeedbackSpecializer reducer(&graph_reducer, &jsgraph, &table, nullptr,
                                       global_object, mode, &dependencies_);
     return reducer.Reduce(node);
   }
 
   Node* EmptyFrameState() {
@@ skipping 274 matching lines @@
               IsReturn(load_field_match, load_field_match, graph()->start()));
   EXPECT_THAT(graph()->end(), IsEnd(ret));
 
   EXPECT_FALSE(dependencies()->IsEmpty());
   dependencies()->Rollback();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8