Created attachment 338062 [details]
Created attachment 338068 [details]
Created attachment 338143 [details]
Decided to be even more conservative and change clobberize for KillStack.
This is all perf neutral so it's probably worth it for the correctness.
Comment on attachment 338143 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=338143&action=review
> + KillStack along one path frough the CFG. Also, the definition of DeadFlush and ConflictingFlush in the comment
Landed in https://trac.webkit.org/changeset/230725/webkit