Currently if you're using the FTL then OSR entry in loops tries to work, and then fails, and then pretends that it had OSR exited, and the heuristics just go downhill from there.
We should have an option to disable OSR entry in loops both for the benefit of the FTL and because it could be interesting for other testing in the future: like you want to see if OSR entry in loops is the cause of a bug, or something.
Created attachment 205948 [details]
Comment on attachment 205948 [details]
Landed in http://trac.webkit.org/changeset/152326