Retain m_attributeBuffer Vector capacity in HTMLFastPathParser::parseAttributes().
Pull request: https://github.com/WebKit/WebKit/pull/10193
Committed 260369@main (c1581646f071): <https://commits.webkit.org/260369@main> Reviewed commits have been landed. Closing PR #10193 and removing active labels.
<rdar://problem/105550197>