[Bug c/102989] Implement C2x's n2763 (_BitInt)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102989

--- Comment #22 from Ulrich Weigand <uweigand at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #15)
> PowerPC I think does, not sure about s390.

For s390x see here:
https://github.com/IBM/s390x-abi