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

[ubizjak at gmail dot com]

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

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
PR71231 looks similar.