Stop using Vector::unsafeAppendWithoutCapacityCheck() in AirAllocateRegistersByGraphColoring.cpp.
Pull request: https://github.com/WebKit/WebKit/pull/20649
Committed 270907@main (dd7600e37d74): <https://commits.webkit.org/270907@main> Reviewed commits have been landed. Closing PR #20649 and removing active labels.
<rdar://problem/118573261>