AnalyzeLayoutTestsResults should be converted to a new-style step. Additionally, all it's calls to add content to stdout should be treated as asynchronous.
<rdar://problem/105041006>
Pull request: https://github.com/WebKit/WebKit/pull/9645
Committed 262104@main (f80c4133ba61): <https://commits.webkit.org/262104@main> Reviewed commits have been landed. Closing PR #9645 and removing active labels.