[turbofan] Turn JSIntrinsicLowering into an AdvancedReducer.

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

Index: test/unittests/compiler/js-intrinsic-lowering-unittest.cc
diff --git a/test/unittests/compiler/js-intrinsic-lowering-unittest.cc b/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
index bc343060caa748453fca4974bd03df419942772f..7c561315b6485efa20a4cc1d790c9b0e50acae13 100644
--- a/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
+++ b/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
@@ -33,7 +33,9 @@ class JSIntrinsicLoweringTest : public GraphTest {
                                    MachineOperatorBuilder::kNoFlags) {
     MachineOperatorBuilder machine(zone(), kMachPtr, flags);
     JSGraph jsgraph(isolate(), graph(), common(), javascript(), &machine);
-    JSIntrinsicLowering reducer(&jsgraph);
+    // TODO(titzer): mock the GraphReducer here for better unit testing.
+    GraphReducer graph_reducer(graph(), zone());
+    JSIntrinsicLowering reducer(&graph_reducer, &jsgraph);
     return reducer.Reduce(node);
   }