Optimize HTMLTokenizer::processEntity() by appending all characters in the StringBuffer at once, instead of one by one.
Pull request: https://github.com/WebKit/WebKit/pull/1254
Committed r295167 (251251@main): <https://commits.webkit.org/251251@main> Reviewed commits have been landed. Closing PR #1254 and removing active labels.
<rdar://problem/94324455>