FunctionExecutable::isCompiling() will effectively always return false. It was probably correct back in the day when there was only the interpreter and the baseline JIT.
Created attachment 254345 [details] Patch
Comment on attachment 254345 [details] Patch r=me
Comment on attachment 254345 [details] Patch Clearing flags on attachment: 254345 Committed r185379: <http://trac.webkit.org/changeset/185379>
All reviewed patches have been landed. Closing bug.