Stop using Vector::unsafeAppendWithoutCapacityCheck() in GetStackTraceFunctor.
Pull request: https://github.com/WebKit/WebKit/pull/20761
Committed 271147@main (7ed7ab670b09): <https://commits.webkit.org/271147@main> Reviewed commits have been landed. Closing PR #20761 and removing active labels.
<rdar://problem/118835983>