MIPS: Add tool to visualize machine code/lithium.

src/mips/lithium-mips.h

Index: src/mips/lithium-mips.h
diff --git a/src/mips/lithium-mips.h b/src/mips/lithium-mips.h
index 68f1de9bda1c3f3939a15e6ce773e3b87d033ea2..301be8fdf2c7054a13bb74e51e7b5841a98eed35 100644
--- a/src/mips/lithium-mips.h
+++ b/src/mips/lithium-mips.h
@@ -212,7 +212,6 @@ class LInstruction : public ZoneObject {
       : environment_(NULL),
         hydrogen_value_(NULL),
         bit_field_(IsCallBits::encode(false)) {
-    set_position(RelocInfo::kNoPosition);
   }
 
   virtual ~LInstruction() {}
@@ -253,15 +252,6 @@ class LInstruction : public ZoneObject {
   LPointerMap* pointer_map() const { return pointer_map_.get(); }
   bool HasPointerMap() const { return pointer_map_.is_set(); }
 
-  // The 31 bits PositionBits is used to store the int position value. And the
-  // position value may be RelocInfo::kNoPosition (-1). The accessor always
-  // +1/-1 so that the encoded value of position in bit_field_ is always >= 0
-  // and can fit into the 31 bits PositionBits.
-  void set_position(int pos) {
-    bit_field_ = PositionBits::update(bit_field_, pos + 1);
-  }
-  int position() { return PositionBits::decode(bit_field_) - 1; }
-
   void set_hydrogen_value(HValue* value) { hydrogen_value_ = value; }
   HValue* hydrogen_value() const { return hydrogen_value_; }
 
@@ -301,7 +291,6 @@ class LInstruction : public ZoneObject {
   virtual LOperand* TempAt(int i) = 0;
 
   class IsCallBits: public BitField<bool, 0, 1> {};
-  class PositionBits: public BitField<int, 1, 31> {};
 
   LEnvironment* environment_;
   SetOncePointer<LPointerMap> pointer_map_;