Stop using Vector::unsafeAppendWithoutCapacityCheck() in TinyLRUCache.
Pull request: https://github.com/WebKit/WebKit/pull/20307
Committed 270556@main (95285984cfab): <https://commits.webkit.org/270556@main> Reviewed commits have been landed. Closing PR #20307 and removing active labels.
<rdar://problem/118244452>