Due to a possible performance regression, re-enable GPU driver prewarming for some versions of macOS.
<rdar://problem/103505840>
Pull request: https://github.com/WebKit/WebKit/pull/7837
Committed 258077@main (af67e80850c1): <https://commits.webkit.org/258077@main> Reviewed commits have been landed. Closing PR #7837 and removing active labels.