[turbofan] Smartify the GraphReducer.

test/cctest/compiler/test-simplified-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 <limits>
 
 #include "src/compiler/access-builder.h"
 #include "src/compiler/change-lowering.h"
 #include "src/compiler/control-builders.h"
 #include "src/compiler/generic-node-inl.h"
@@ skipping 45 matching lines @@
   void LowerAllNodesAndLowerChanges() {
     this->End();
     typer.Run();
     lowering.LowerAllNodes();
 
     Zone* zone = this->zone();
     CompilationInfo info(zone->isolate(), zone);
     Linkage linkage(
         zone, Linkage::GetSimplifiedCDescriptor(zone, this->machine_sig_));
     ChangeLowering lowering(&jsgraph, &linkage);
-    GraphReducer reducer(this->graph());
+    GraphReducer reducer(this->graph(), this->zone());
     reducer.AddReducer(&lowering);
     reducer.ReduceGraph();
     Verifier::Run(this->graph());
   }
 
   void CheckNumberCall(double expected, double input) {
     // TODO(titzer): make calls to NewNumber work in cctests.
     if (expected <= Smi::kMinValue) return;
     if (expected >= Smi::kMaxValue) return;
     Handle<Object> num = factory()->NewNumber(input);
@@ skipping 1969 matching lines @@
     Bounds phi_bounds = Bounds::Either(Bounds(d.arg1), Bounds(d.arg2), z);
     NodeProperties::SetBounds(phi, phi_bounds);
 
     Node* use = t.Use(phi, d.use);
     t.Return(use);
     t.Lower();
 
     CHECK_EQ(d.expected, OpParameter<MachineType>(phi));
   }
 }