[turbofan] Turn JSTypedLowering into an AdvancedReducer.

test/cctest/compiler/test-js-typed-lowering.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator-properties.h"
@@ skipping 71 matching lines @@
     Node* state_node =
         graph.NewNode(common.FrameState(JS_FRAME, BailoutId::None(),
                                         OutputFrameStateCombine::Ignore()),
                       parameters, locals, stack, context, UndefinedConstant());
 
     return state_node;
   }
 
   Node* reduce(Node* node) {
     JSGraph jsgraph(main_isolate(), &graph, &common, &javascript, &machine);
-    JSTypedLowering reducer(&jsgraph, main_zone());
+    // TODO(titzer): mock the GraphReducer here for better unit testing.
+    GraphReducer graph_reducer(&graph, main_zone());
+    JSTypedLowering reducer(&graph_reducer, &jsgraph, main_zone());
     Reduction reduction = reducer.Reduce(node);
     if (reduction.Changed()) return reduction.replacement();
     return node;
   }
 
   Node* start() { return graph.start(); }
 
   Node* context() {
     if (context_node == NULL) {
       context_node = graph.NewNode(common.Parameter(-1), graph.start());
@@ skipping 1169 matching lines @@
           CHECK_EQ(p1, r->InputAt(0));
           CHECK_EQ(p0, r->InputAt(1));
         } else {
           CHECK_EQ(p0, r->InputAt(0));
           CHECK_EQ(p1, r->InputAt(1));
         }
       }
     }
   }
 }