Implement tracking and optimizations of packed arrays

src/string-stream.cc

Index: src/string-stream.cc
diff --git a/src/string-stream.cc b/src/string-stream.cc
index 35f7be5416019770a72505bbc3acf1aa071d422b..bf711bac71e0b95c74db65bc42b524e6db383e9c 100644
--- a/src/string-stream.cc
+++ b/src/string-stream.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// 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:
@@ -427,7 +427,7 @@ void StringStream::PrintMentionedObjectCache() {
       PrintUsingMap(JSObject::cast(printee));
       if (printee->IsJSArray()) {
         JSArray* array = JSArray::cast(printee);
-        if (array->HasFastElements()) {
+        if (array->HasFastObjectElements()) {
           unsigned int limit = FixedArray::cast(array->elements())->length();
           unsigned int length =
             static_cast<uint32_t>(JSArray::cast(array)->length()->Number());