Fix LStoreKeyed error when tracing instruction.

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 1c64d8e61ef97c39781ea1afb1be93f48ee254c3..5463a9a87f8fda421cce745b36b6d5d2aa14a75f 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -405,7 +405,14 @@ void LStoreKeyed::PrintDataTo(StringStream* stream) {
   } 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);
+  }
 }