[Bug tree-optimization/85560] Missed optimization in niter analysis for bit-by-bit variable zeroing

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85560

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I should note clang is able to figure this is finite and able to remove the
loop even in C mode.