[Bug target/39258] No ABI warnings on __m128i when SSE is disabled

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39258

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
union sse2 does not pass via a register for me on x86_64