Merge ElementName and AttributeName enumerations into a single enumeration named NodeName. This makes QualifiedName smaller and avoids double lookup when trying to convert match a QualifiedName to an element or attribute name.
Pull request: https://github.com/WebKit/WebKit/pull/12716
Committed 262969@main (9da2b02e31a2): <https://commits.webkit.org/262969@main> Reviewed commits have been landed. Closing PR #12716 and removing active labels.
<rdar://problem/108050809>