[turbofan] Remove locally constructed simplified builders.

test/unittests/compiler/js-typed-lowering-unittest.cc

Index: test/unittests/compiler/js-typed-lowering-unittest.cc
diff --git a/test/unittests/compiler/js-typed-lowering-unittest.cc b/test/unittests/compiler/js-typed-lowering-unittest.cc
index 683bbd5385ce984ad592c3e3a4026ecb346a6ae2..16557482662a2e3ee15e5a9a9cb59102b108db8a 100644
--- a/test/unittests/compiler/js-typed-lowering-unittest.cc
+++ b/test/unittests/compiler/js-typed-lowering-unittest.cc
@@ -80,7 +80,8 @@ class JSTypedLoweringTest : public TypedGraphTest {
  protected:
   Reduction Reduce(Node* node) {
     MachineOperatorBuilder machine(zone());
-    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());