MIPS: Add tool to visualize machine code/lithium.

src/mips/lithium-codegen-mips.h

Index: src/mips/lithium-codegen-mips.h
diff --git a/src/mips/lithium-codegen-mips.h b/src/mips/lithium-codegen-mips.h
index e3d3a600bea9c5fb1fb288564999e58093e8cbde..f643d021912b4c0cd5971f5c1fab8700b3330750 100644
--- a/src/mips/lithium-codegen-mips.h
+++ b/src/mips/lithium-codegen-mips.h
@@ -58,8 +58,7 @@ class LCodeGen: public LCodeGenBase {
         frame_is_built_(false),
         safepoints_(info->zone()),
         resolver_(this),
-        expected_safepoint_kind_(Safepoint::kSimple),
-        old_position_(RelocInfo::kNoPosition) {
+        expected_safepoint_kind_(Safepoint::kSimple) {
     PopulateDeoptimizationLiteralsWithInlinedFunctions();
   }
 
@@ -295,8 +294,8 @@ class LCodeGen: public LCodeGenBase {
   void RecordSafepointWithRegistersAndDoubles(LPointerMap* pointers,
                                               int arguments,
                                               Safepoint::DeoptMode mode);
-  void RecordPosition(int position);
-  void RecordAndUpdatePosition(int position) V8_OVERRIDE;
+
+  void RecordAndWritePosition(int position) V8_OVERRIDE;
 
   static Condition TokenToCondition(Token::Value op, bool is_unsigned);
   void EmitGoto(int block);
@@ -402,8 +401,6 @@ class LCodeGen: public LCodeGenBase {
 
   Safepoint::Kind expected_safepoint_kind_;
 
-  int old_position_;
-
   class PushSafepointRegistersScope V8_FINAL  BASE_EMBEDDED {
    public:
     PushSafepointRegistersScope(LCodeGen* codegen,