[turbofan] Reenable value numbering.

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index ca58e173bdb27c7574f6123f83328a626817c18c..fce352ab63bfeb9f4d78e375ff2388612c56ecac 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -291,13 +291,13 @@ Handle<Code> Pipeline::GenerateCode() {
                                      SourcePosition::Unknown());
       Linkage linkage(info());
       // TODO(turbofan): Value numbering disabled for now.

[Michael Starzinger, 2014/10/08 07:53:02]

The TODO can be dropped.

[Benedikt Meurer, 2014/10/08 08:05:28]

Done.

-      // ValueNumberingReducer vn_reducer(zone());
+      ValueNumberingReducer vn_reducer(zone());
       SimplifiedOperatorReducer simple_reducer(&jsgraph);
       ChangeLowering lowering(&jsgraph, &linkage);
       MachineOperatorReducer mach_reducer(&jsgraph);
       GraphReducer graph_reducer(&graph);
       // TODO(titzer): Figure out if we should run all reducers at once here.
-      // graph_reducer.AddReducer(&vn_reducer);
+      graph_reducer.AddReducer(&vn_reducer);
       graph_reducer.AddReducer(&simple_reducer);
       graph_reducer.AddReducer(&lowering);
       graph_reducer.AddReducer(&mach_reducer);