[tubofan] Remove .dot output of --trace-turbo

src/compiler/graph-visualizer.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_VISUALIZER_H_
 #define V8_COMPILER_GRAPH_VISUALIZER_H_
 
 #include <stdio.h>
 #include <iosfwd>
 
 namespace v8 {
 namespace internal {
 
 class CompilationInfo;
 
 namespace compiler {
 
 class Graph;
 class InstructionSequence;
 class RegisterAllocationData;
 class Schedule;
 class SourcePositionTable;
 
 FILE* OpenVisualizerLogFile(CompilationInfo* info, const char* phase,
                             const char* suffix, const char* mode);
 
-struct AsDOT {
-  explicit AsDOT(const Graph& g) : graph(g) {}
-  const Graph& graph;
-};
-
-std::ostream& operator<<(std::ostream& os, const AsDOT& ad);
-
-
 struct AsJSON {
   AsJSON(const Graph& g, SourcePositionTable* p) : graph(g), positions(p) {}
   const Graph& graph;
   const SourcePositionTable* positions;
 };
 
 std::ostream& operator<<(std::ostream& os, const AsJSON& ad);
 
 struct AsRPO {
   explicit AsRPO(const Graph& g) : graph(g) {}
@@ skipping 24 matching lines @@
 };
 
 struct AsC1VRegisterAllocationData {
   explicit AsC1VRegisterAllocationData(
       const char* phase, const RegisterAllocationData* data = nullptr)
       : phase_(phase), data_(data) {}
   const char* phase_;
   const RegisterAllocationData* data_;
 };
 
-std::ostream& operator<<(std::ostream& os, const AsDOT& ad);
 std::ostream& operator<<(std::ostream& os, const AsC1VCompilation& ac);
 std::ostream& operator<<(std::ostream& os, const AsC1V& ac);
 std::ostream& operator<<(std::ostream& os,
                          const AsC1VRegisterAllocationData& ac);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_GRAPH_VISUALIZER_H_