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Created attachment 385627 [details] patch This should work. Going to test it now.
Comment on attachment 385627 [details] patch r=me I would prefer to use a separate FinalizerOwner rather than bit masking the pointer because it would be a little clearer.
Created attachment 385631 [details] patch for landing
Comment on attachment 385631 [details] patch for landing Clearing flags on attachment: 385631 Committed r253500: <https://trac.webkit.org/changeset/253500>
All reviewed patches have been landed. Closing bug.
<rdar://problem/57925827>