[Bug target/93002] while(i--) optimization

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93002

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk?

countdown_i_used:
.LFB0:
        .cfi_startproc
        movl    $999, %eax
        .p2align 4,,10
        .p2align 3
.L2:
        movl    %eax, sink(%rip)
        subl    $1, %eax
        jnb     .L2
        ret