[Bug bootstrap/66801] [6 Regression] gcc miscompiled during PGO/LTO bootstrap

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66801

--- Comment #10 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #9)
> Ah, you used release checking...  damn.

Also note the various FLAGS that I use in comment0. 
Both PGO and LTO are needed. 
PGO alone is fine, LTO alone is fine and bootstrap-O3 alone is also fine.