[Bug rtl-optimization/71779] [5/6/7 regression] isl miscompiled with -mabi=ilp32

[tamar.christina at arm dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71779

--- Comment #13 from Tamar Christina <tamar.christina at arm dot com> ---
Also successfully bootstrapped on an aarch64 juno board and no regressions.