[turbofan] Cleanup Graph and related classes.

test/unittests/compiler/common-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/compiler/common-operator.h"
 #include "src/compiler/common-operator-reducer.h"
 #include "src/compiler/machine-type.h"
+#include "src/compiler/operator.h"
 #include "test/unittests/compiler/graph-unittest.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class CommonOperatorReducerTest : public GraphTest {
  public:
   explicit CommonOperatorReducerTest(int num_parameters = 1)
       : GraphTest(num_parameters) {}
@@ skipping 83 matching lines @@
           graph()->NewNode(common()->Select(type, hint), input, input, input));
       ASSERT_TRUE(r.Changed());
       EXPECT_EQ(input, r.replacement());
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8