Enable WeakRefs/FinalizationRegistries by default.
Created attachment 407155 [details] Patch
Created attachment 407156 [details] Patch
Comment on attachment 407156 [details] Patch Need to fix my fixme first.
<rdar://problem/68110816>
Created attachment 410961 [details] Patch
Comment on attachment 410961 [details] Patch r=me
Committed r268284: <https://trac.webkit.org/changeset/268284> All reviewed patches have been landed. Closing bug and clearing flags on attachment 410961 [details].