Make "is being destroyed" a RenderObject concept instead of restricting it to RenderBlocks. I'm guessing that this was specific to blocks due to lack of bitfield space in RenderObject, and that's no longer an issue.
Created attachment 240518 [details] Patch
Comment on attachment 240518 [details] Patch Clearing flags on attachment: 240518 Committed r175242: <http://trac.webkit.org/changeset/175242>
All reviewed patches have been landed. Closing bug.