[turbofan] Move SimplifiedOperatorBuilder into JSGraph.

test/unittests/compiler/js-builtin-reducer-unittest.cc

Index: test/unittests/compiler/js-builtin-reducer-unittest.cc
diff --git a/test/unittests/compiler/js-builtin-reducer-unittest.cc b/test/unittests/compiler/js-builtin-reducer-unittest.cc
index 9e0cee0d3d73e7ba6a69241e67fa9faa1a206de4..7555fe8e0ec31a24495c212b4cbfb9b2de91aa68 100644
--- a/test/unittests/compiler/js-builtin-reducer-unittest.cc
+++ b/test/unittests/compiler/js-builtin-reducer-unittest.cc
@@ -26,7 +26,8 @@ class JSBuiltinReducerTest : public TypedGraphTest {
   Reduction Reduce(Node* node, MachineOperatorBuilder::Flags flags =
                                    MachineOperatorBuilder::Flag::kNoFlags) {
     MachineOperatorBuilder machine(zone(), kMachPtr, flags);
-    JSGraph jsgraph(isolate(), graph(), common(), javascript(), &machine);
+    JSGraph jsgraph(isolate(), graph(), common(), javascript(), nullptr,
+                    &machine);
     // TODO(titzer): mock the GraphReducer here for better unit testing.
     GraphReducer graph_reducer(zone(), graph());
     JSBuiltinReducer reducer(&graph_reducer, &jsgraph);