Support for revivers was introduced in bug 26591, but the function length has since remained unchanged. This can be tested with "ietestcenter/Javascript/15.12.2-0-2.html".
Created attachment 77536 [details] Patch
Comment on attachment 77536 [details] Patch Clearing flags on attachment: 77536 Committed r74721: <http://trac.webkit.org/changeset/74721>
All reviewed patches have been landed. Closing bug.