[Bug tree-optimization/77536] Vectorizer not maintaining relationship of relative block frequencies in absence of real profile data

[pthaugen at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77536

--- Comment #3 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
pr78116 contains a couple testcases that showed degradation on x86 caused by
spill inside a vectorized loop due to messed up BB frequencies.