Stop using Vector::unsafeAppendWithoutCapacityCheck() in MarkedBlock::Handle::specializedSweep().
Pull request: https://github.com/WebKit/WebKit/pull/20700
Committed 270939@main (c30ca46c17f8): <https://commits.webkit.org/270939@main> Reviewed commits have been landed. Closing PR #20700 and removing active labels.
<rdar://problem/118602040>