[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

Tamar Christina <tamar.christina at arm dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |tamar.christina at arm dot com

--- Comment #11 from Tamar Christina <tamar.christina at arm dot com> ---
The patch seems to also fix https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70903
where it's also confused about the paradoxical subreg.

I'll bootstrap and reg-test on aarch64.