[turbofan] Turn JSBuiltinReducer into an AdvancedReducer.

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 a56fee1150e3107b367a398b302f105f5afce911..b452ba56c504bede2b523e2ee4facf0b8dc9aeb4 100644
--- a/test/unittests/compiler/js-builtin-reducer-unittest.cc
+++ b/test/unittests/compiler/js-builtin-reducer-unittest.cc
@@ -26,7 +26,9 @@ class JSBuiltinReducerTest : public TypedGraphTest {
                                    MachineOperatorBuilder::Flag::kNoFlags) {
     MachineOperatorBuilder machine(zone(), kMachPtr, flags);
     JSGraph jsgraph(isolate(), graph(), common(), javascript(), &machine);
-    JSBuiltinReducer reducer(&jsgraph);
+    // TODO(titzer): mock the GraphReducer here for better unit testing.

[titzer, 2015/06/05 12:30:50]

u wot m8?

+    GraphReducer graph_reducer(zone(), graph());
+    JSBuiltinReducer reducer(&graph_reducer, &jsgraph);
     return reducer.Reduce(node);
   }