Deprecte LoweringBuilder in favor of Reducer.

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index e32a51e136b2e5453a44a344766ff0d933c410b4..158cfc5a9f23b0d246e796d04a8181c4c7b0483e 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -719,7 +719,9 @@ void SimplifiedLowering::LowerAllNodes() {
   RepresentationSelector selector(jsgraph(), zone(), &changer);
   selector.Run(this);
 
-  LoweringBuilder::LowerAllNodes();
+  GraphReducer graph_reducer(graph());
+  graph_reducer.AddReducer(this);
+  graph_reducer.ReduceGraph();
 }
 
 
@@ -974,7 +976,7 @@ void SimplifiedLowering::DoStoreElement(Node* node) {
 }
 
 
-void SimplifiedLowering::Lower(Node* node) {}
+Reduction SimplifiedLowering::Reduce(Node* node) { return NoChange(); }
 
 
 void SimplifiedLowering::LowerChange(Node* node, Node* effect, Node* control) {