[Bug tree-optimization/79744] [7 Regression] The polyhedron test rnflow.f90 is miscompiled with -O3 after r236361

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79744

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
-fno-tree-loop-distribute-patterns doesn't help so your bisection is bogus I
think.  Disabling VRP helps though, so trying own bisect with a hint of
r236336.