[Bug tree-optimization/68398] [6 Regression] coremark regression due to r229685

[spop at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68398

--- Comment #4 from Sebastian Pop <spop at gcc dot gnu.org> ---
Thanks Jeff for looking into this issue.
I was thinking about a heuristic as you mentioned in comment #2:
what about allowing creation of irreducible loops, multiple latches, etc. after
the loop optimizers are done?