[turbofan] Output file for C1 visualizer.

src/compiler/source-position.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/source-position.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/node-aux-data-inl.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 28 matching lines @@
 }
 
 
 void SourcePositionTable::RemoveDecorator() {
   DCHECK(decorator_ != NULL);
   graph_->RemoveDecorator(decorator_);
   decorator_ = NULL;
 }
 
 
-SourcePosition SourcePositionTable::GetSourcePosition(Node* node) {
+SourcePosition SourcePositionTable::GetSourcePosition(Node* node) const {
   return table_.Get(node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8