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


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

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ok, so the only code-gen difference possible is due to match.pd patterns
applying/not applying because of the changed iteration order making lattice
values final at different times.

Thus I suspect a latent bug in a match.pd pattern.  Which means to possibly
"bisect" those?

I'm now first trying to reproduce.


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