MarkupAccumulator::serializeNodesWithNamespaces should be iterative instead of recursive for better performance.
<rdar://problem/98414518>
Pull request: https://github.com/WebKit/WebKit/pull/3171
Committed 253838@main (80e642edd5e4): <https://commits.webkit.org/253838@main> Reviewed commits have been landed. Closing PR #3171 and removing active labels.