Before casting v8::RetainedObjectInfo to WebCore::RetainedObjectInfo we should check if it is an instance of WebCore::RetainedObjectInfo as it may happen to be an instance of v8::internal::NativeGroupRetainedObjectInfo. This check can be accomplished by comparing labels of the two objects as the labels should be unique for retained groups.
Created attachment 161163 [details] Patch
Comment on attachment 161163 [details] Patch lgtm
Comment on attachment 161163 [details] Patch Clearing flags on attachment: 161163 Committed r126989: <http://trac.webkit.org/changeset/126989>
All reviewed patches have been landed. Closing bug.