Add tool to visualize machine code/lithium.

src/lithium.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 458 matching lines @@
 
   void PrintDataTo(StringStream* stream) const;
 
  private:
   ZoneList<LMoveOperands> move_operands_;
 };
 
 
 class LPointerMap V8_FINAL : public ZoneObject {
  public:
-  explicit LPointerMap(int position, Zone* zone)
+  explicit LPointerMap(Zone* zone)
       : pointer_operands_(8, zone),
         untagged_operands_(0, zone),
-        position_(position),
         lithium_position_(-1) { }
 
   const ZoneList<LOperand*>* GetNormalizedOperands() {
     for (int i = 0; i < untagged_operands_.length(); ++i) {
       RemovePointer(untagged_operands_[i]);
     }
     untagged_operands_.Clear();
     return &pointer_operands_;
   }
-  int position() const { return position_; }
   int lithium_position() const { return lithium_position_; }
 
   void set_lithium_position(int pos) {
     ASSERT(lithium_position_ == -1);
     lithium_position_ = pos;
   }
 
   void RecordPointer(LOperand* op, Zone* zone);
   void RemovePointer(LOperand* op);
   void RecordUntagged(LOperand* op, Zone* zone);
   void PrintTo(StringStream* stream);
 
  private:
   ZoneList<LOperand*> pointer_operands_;
   ZoneList<LOperand*> untagged_operands_;
-  int position_;
   int lithium_position_;
 };
 
 
 class LEnvironment V8_FINAL : public ZoneObject {
  public:
   LEnvironment(Handle<JSFunction> closure,
                FrameType frame_type,
                BailoutId ast_id,
                int parameter_count,
@@ skipping 294 matching lines @@
  private:
   LChunk* chunk_;
 
   DISALLOW_COPY_AND_ASSIGN(LPhase);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LITHIUM_H_