Add tool to visualize machine code/lithium.

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index ac1a03ed8487ec13d3835eedeaac259f0ea06589..3fb07bc2c1207b0d912c7784a673d9162c57bda5 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -656,7 +656,7 @@ LInstruction* LChunkBuilder::MarkAsCall(LInstruction* instr,
 
 LInstruction* LChunkBuilder::AssignPointerMap(LInstruction* instr) {
   ASSERT(!instr->HasPointerMap());
-  instr->set_pointer_map(new(zone()) LPointerMap(position_, zone()));
+  instr->set_pointer_map(new(zone()) LPointerMap(zone()));
   return instr;
 }
 
@@ -914,7 +914,6 @@ void LChunkBuilder::VisitInstruction(HInstruction* current) {
     }
 #endif
 
-    instr->set_position(position_);
     if (FLAG_stress_pointer_maps && !instr->HasPointerMap()) {
       instr = AssignPointerMap(instr);
     }