It's possible that due to concurrency, we invalidate the compilation after the last run of the CFA phase but before the backend. Then, when AI runs during the backend, it might think that some code that was previously thought to be Unreachable is now reachable. We shouldn't crash when this happens.
Created attachment 281032 [details]
Comment on attachment 281032 [details]
Landed in http://trac.webkit.org/changeset/201936