Leverage isASCIIAlphanumeric() in the new HTML parsing fast path.
Pull request: https://github.com/WebKit/WebKit/pull/10000
Committed 260171@main (49602fccdbc6): <https://commits.webkit.org/260171@main> Reviewed commits have been landed. Closing PR #10000 and removing active labels.
<rdar://problem/105368915>