56f31328f2
regparm(0) attribute does not work on aarch64 (and presumably powerpc64 and others). Default to not specifying any calling convention on non-amd64/i386 platforms. Reviewed-by: Marek Olšák <marek.olsak@amd.com> Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3567> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3567>