[Bug tree-optimization/69595] [6 Regression] Bogus -Warray-bound warning due to missed optimization

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69595

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
We want to improve extract_range_from_comparison to build a symbolic range
instead of varying here.