Currently, there's no limit on retries if a job fails on the `CompileWebKitWithoutChanges()` step. This may cause some jobs based on "bad" revisions to get stuck on the bots as the `CompileWebKitWithoutChange()` step would never succeed without some manual intervention like rebasing or cleanup of the bots. Patch incoming.
Pull request: https://github.com/WebKit/WebKit/pull/5771
<rdar://problem/101819892>