provides a mechanism for optimizing compilers to select the different Register configuration.

src/compiler/graph-visualizer.cc

 // 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.
 
 #include "src/compiler/graph-visualizer.h"
 
 #include <sstream>
 #include <string>
 
 #include "src/code-stubs.h"
@@ skipping 656 matching lines @@
         }
         os_ << " <|@\n";
       }
     }
 
     if (instructions != NULL) {
       Tag LIR_tag(this, "LIR");
       for (int j = instruction_block->first_instruction_index();
            j <= instruction_block->last_instruction_index(); j++) {
         PrintIndent();
-        PrintableInstruction printable = {RegisterConfiguration::ArchDefault(),
-                                          instructions->InstructionAt(j)};
+        PrintableInstruction printable = {
+            RegisterConfiguration::ArchDefault(RegisterConfiguration::TURBOFAN),
+            instructions->InstructionAt(j)};
         os_ << j << " " << printable << " <|@\n";
       }
     }
   }
 }
 
 
 void GraphC1Visualizer::PrintLiveRanges(const char* phase,
                                         const RegisterAllocationData* data) {
   Tag tag(this, "intervals");
@@ skipping 131 matching lines @@
         os << "#" << SafeId(i) << ":" << SafeMnemonic(i);
       }
       os << ")" << std::endl;
     }
   }
   return os;
 }
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8