[Bug tree-optimization/77921] [7 Regression] tree-ssanames.c miscompiled during PGO bootstrap

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77921

--- Comment #5 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to kugan from comment #4)
> Sorry about the breakage. I will try to reproduce it.
> 
> (In reply to Markus Trippelsdorf from comment #1)
> > gcc version 7.0.0 20161007 was fine
> Are you saying that this is issue is gone latent? 20161007 should have
> early-vrp and ipa-vrp.

Since r240865 PGO bootstrapped gcc spins when compiling crafty.
So the question is if the endless loop is legitimate or not.
If not, then r240291 is causing wrong code.
If OK, then Richi's r240865 is the cause and this bug is a dup of PR77920.