Refactor ChangeLowering class to avoid template specialization.

test/compiler-unittests/machine-operator-reducer-unittest.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/base/bits.h"
-#include "src/compiler/common-operator.h"
-#include "src/compiler/graph.h"
 #include "src/compiler/machine-operator-reducer.h"
-#include "test/compiler-unittests/compiler-unittests.h"
-#include "test/compiler-unittests/node-matchers.h"
+#include "test/compiler-unittests/graph-unittest.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
-class MachineOperatorReducerTest : public CompilerTest {
+class MachineOperatorReducerTest : public GraphTest {
  public:
   explicit MachineOperatorReducerTest(int num_parameters = 2)
-      : graph_(zone()), common_(zone()), machine_(zone()) {
-    graph()->SetStart(graph()->NewNode(common()->Start(num_parameters)));
-  }
+      : GraphTest(num_parameters), machine_(zone()) {}
   virtual ~MachineOperatorReducerTest() {}
 
  protected:
   Node* Parameter(int32_t index) {
     return graph()->NewNode(common()->Parameter(index), graph()->start());
   }
   Node* Int32Constant(int32_t value) {
     return graph()->NewNode(common()->Int32Constant(value));
   }
 
   Reduction Reduce(Node* node) {
     MachineOperatorReducer reducer(graph());
     return reducer.Reduce(node);
   }
 
-  Graph* graph() { return &graph_; }
-  CommonOperatorBuilder* common() { return &common_; }
   MachineOperatorBuilder* machine() { return &machine_; }
 
  private:
-  Graph graph_;
-  CommonOperatorBuilder common_;
   MachineOperatorBuilder machine_;
 };
 
 
 namespace {
 
 static const uint32_t kConstants[] = {
     0x00000000, 0x00000001, 0xffffffff, 0x1b09788b, 0x04c5fce8, 0xcc0de5bf,
     0x273a798e, 0x187937a3, 0xece3af83, 0x5495a16b, 0x0b668ecc, 0x11223344,
     0x0000009e, 0x00000043, 0x0000af73, 0x0000116b, 0x00658ecc, 0x002b3b4c,
@@ skipping 76 matching lines @@
       EXPECT_TRUE(reduction.Changed());
       EXPECT_THAT(reduction.replacement(),
                   IsInt32Constant(base::bits::RotateRight32(x, y)));
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8