Update HTMLFastPathParser::scanAttributeValue() to return an AtomString instead of a std::variant<Span<const LChar>, Span<const UChar>>.
Pull request: https://github.com/WebKit/WebKit/pull/12353
Committed 262580@main (7f3a0f6e0eff): <https://commits.webkit.org/262580@main> Reviewed commits have been landed. Closing PR #12353 and removing active labels.
<rdar://problem/107617625>