[turbofan] Output file for C1 visualizer.

src/compiler/node-aux-data.h

 // 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.
 
 #ifndef V8_COMPILER_NODE_AUX_DATA_H_
 #define V8_COMPILER_NODE_AUX_DATA_H_
 
 #include "src/zone-containers.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // Forward declarations.
 class Graph;
 class Node;
 
 template <class T>
 class NodeAuxData {
  public:
   inline explicit NodeAuxData(Zone* zone);
 
   inline void Set(Node* node, const T& data);
-  inline T Get(Node* node);
+  inline T Get(Node* node) const;
 
  private:
   ZoneVector<T> aux_data_;
 };
 }
 }
 }  // namespace v8::internal::compiler
 
 #endif