[Bug tree-optimization/119959] [15/16 regression] simple loop miscompiled into an endless loop

[mcccs at gmx dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119959

--- Comment #5 from mcccs at gmx dot com ---
Bisection points at r15-988-g5316c35b13cf53

also target aarch64 as well

.L8:
        add     x19, x19, 8
        cmp     x20, x19
        beq     .L16

versus

.L7:
        add     x19, x19, 8