Optimize / simplify slow case in StringView::convertASCIILowercaseAtom().
Pull request: https://github.com/WebKit/WebKit/pull/503
Pull request: https://github.com/WebKit/WebKit/pull/504
Committed r293807 (250280@main): <https://commits.webkit.org/250280@main> Reviewed commits have been landed. Closing PR #504 and removing active labels.
<rdar://problem/92764539>