'run-benchmark' script should not fail when script is out of a git checkout.
<rdar://problem/99465558>
Pull request: https://github.com/WebKit/WebKit/pull/3950
Pull request: https://github.com/WebKit/WebKit/pull/4550
Committed 254705@main (05987b8edd7e): <https://commits.webkit.org/254705@main> Reviewed commits have been landed. Closing PR #4550 and removing active labels.