MIPS: Fix LStoreKeyed error when tracing instruction.

src/mips/lithium-mips.cc

 // 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 391 matching lines @@
 
 void LStoreKeyed::PrintDataTo(StringStream* stream) {
   elements()->PrintTo(stream);
   stream->Add("[");
   key()->PrintTo(stream);
   if (hydrogen()->IsDehoisted()) {
     stream->Add(" + %d] <-", additional_index());
   } else {
     stream->Add("] <- ");
   }
-  value()->PrintTo(stream);
+
+  if (value() == NULL) {
+    ASSERT(hydrogen()->IsConstantHoleStore() &&
+           hydrogen()->value()->representation().IsDouble());
+    stream->Add("<the hole(nan)>");
+  } else {
+    value()->PrintTo(stream);
+  }
 }
 
 
 void LStoreKeyedGeneric::PrintDataTo(StringStream* stream) {
   object()->PrintTo(stream);
   stream->Add("[");
   key()->PrintTo(stream);
   stream->Add("] <- ");
   value()->PrintTo(stream);
 }
@@ skipping 2076 matching lines @@
 
 
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseRegister(instr->index());
   return DefineAsRegister(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal