[Bug tree-optimization/77848] Gimple if-conversion results in redundant comparisons

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77848

--- Comment #24 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
The above commit doesn't yet solve the problem, but enables more outer-loop
vectorization in preparation for the fix.