[turbofan] New GraphReducer based LoadElimination.

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index 949e279a17d7b0a2b401be7bc94cc347e108381d..a42c80254a9d4010bca7f5b2234c0ad10ad834e2 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -902,7 +902,6 @@ struct TypedLoweringPhase {
         data->info()->is_deoptimization_enabled()
             ? JSIntrinsicLowering::kDeoptimizationEnabled
             : JSIntrinsicLowering::kDeoptimizationDisabled);
-    ValueNumberingReducer value_numbering(temp_zone, data->graph()->zone());
     SimplifiedOperatorReducer simple_reducer(&graph_reducer, data->jsgraph());
     CheckpointElimination checkpoint_elimination(&graph_reducer);
     CommonOperatorReducer common_reducer(&graph_reducer, data->graph(),
@@ -914,7 +913,6 @@ struct TypedLoweringPhase {
     }
     AddReducer(data, &graph_reducer, &typed_lowering);
     AddReducer(data, &graph_reducer, &intrinsic_lowering);
-    AddReducer(data, &graph_reducer, &value_numbering);
     AddReducer(data, &graph_reducer, &simple_reducer);
     AddReducer(data, &graph_reducer, &checkpoint_elimination);
     AddReducer(data, &graph_reducer, &common_reducer);
@@ -1052,15 +1050,14 @@ struct LoadEliminationPhase {
   static const char* phase_name() { return "load elimination"; }
 
   void Run(PipelineData* data, Zone* temp_zone) {
-    // The memory optimizer requires the graphs to be trimmed, so trim now.
-    GraphTrimmer trimmer(temp_zone, data->graph());
-    NodeVector roots(temp_zone);
-    data->jsgraph()->GetCachedNodes(&roots);
-    trimmer.TrimGraph(roots.begin(), roots.end());
-
-    // Eliminate redundant loads.
-    LoadElimination load_elimination(data->graph(), temp_zone);
-    load_elimination.Run();
+    JSGraphReducer graph_reducer(data->jsgraph(), temp_zone);
+    RedundancyElimination redundancy_elimination(&graph_reducer, temp_zone);
+    LoadElimination load_elimination(&graph_reducer, temp_zone);
+    ValueNumberingReducer value_numbering(temp_zone, data->graph()->zone());
+    AddReducer(data, &graph_reducer, &redundancy_elimination);
+    AddReducer(data, &graph_reducer, &load_elimination);
+    AddReducer(data, &graph_reducer, &value_numbering);
+    graph_reducer.ReduceGraph();
   }
 };