Avoid using Vector::unsafeAppendWithoutCapacityCheck() in ThreadSafeWeakHashSet::values().
Pull request: https://github.com/WebKit/WebKit/pull/20281
Committed 270529@main (f870891782f2): <https://commits.webkit.org/270529@main> Reviewed commits have been landed. Closing PR #20281 and removing active labels.
<rdar://problem/118234076>