[turbofan] Cleanup Graph and related classes.

src/compiler/graph-builder.h

 // Copyright 2013 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.
 
 #ifndef V8_COMPILER_GRAPH_BUILDER_H_
 #define V8_COMPILER_GRAPH_BUILDER_H_
 
 #include "src/v8.h"
 
 #include "src/allocation.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
+#include "src/compiler/node.h"
 #include "src/unique.h"
 
 namespace v8 {
 namespace internal {
 
 class BitVector;
 
 namespace compiler {
 
 class Node;
@@ skipping 216 matching lines @@
   StructuredGraphBuilder* builder_;
   Node* control_dependency_;
   Node* effect_dependency_;
   NodeVector values_;
 };
 }
 }
 }  // namespace v8::internal::compiler
 
 #endif  // V8_COMPILER_GRAPH_BUILDER_H__