[turbofan] Remove locally constructed simplified builders.

test/unittests/compiler/js-builtin-reducer-unittest.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 "src/compiler/js-builtin-reducer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
+#include "src/compiler/simplified-operator.h"
 #include "src/compiler/typer.h"
 #include "src/isolate-inl.h"
 #include "test/unittests/compiler/graph-unittest.h"
 #include "test/unittests/compiler/node-test-utils.h"
 #include "testing/gmock-support.h"
 
 using testing::BitEq;
 using testing::Capture;
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class JSBuiltinReducerTest : public TypedGraphTest {
  public:
   JSBuiltinReducerTest() : javascript_(zone()) {}
 
  protected:
   Reduction Reduce(Node* node, MachineOperatorBuilder::Flags flags =
                                    MachineOperatorBuilder::Flag::kNoFlags) {
     MachineOperatorBuilder machine(zone(), kMachPtr, flags);
-    JSGraph jsgraph(isolate(), graph(), common(), javascript(), nullptr,
+    SimplifiedOperatorBuilder simplified(zone());
+    JSGraph jsgraph(isolate(), graph(), common(), javascript(), &simplified,
                     &machine);
     // TODO(titzer): mock the GraphReducer here for better unit testing.
     GraphReducer graph_reducer(zone(), graph());
     JSBuiltinReducer reducer(&graph_reducer, &jsgraph);
     return reducer.Reduce(node);
   }
 
   Node* MathFunction(const char* name) {
     Handle<Object> m =
         JSObject::GetProperty(isolate()->global_object(),
@@ skipping 157 matching lines @@
 
       ASSERT_TRUE(r.Changed());
       EXPECT_THAT(r.replacement(), IsTruncateFloat64ToFloat32(p0));
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8