[Bug target/83402] PPC64 implementation of ./rs6000/emmintrin.h gives out of range for _mm_slli_epi32

[munroesj at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83402

--- Comment #9 from Steven Munroe <munroesj at gcc dot gnu.org> ---
I suggested fixing the emmintrin.h source for both eventually ...

If you only fix AT11 then sometime later some will discover the difference and
try fix it. And likely break it again.

So fix AT immediately (with comments for why). Then when gcc trunk opens up.
fix it there as a code clean up and ask for a backport to gcc8 stable.

Because if you leave it alone in gcc 8. it might break again in gcc 9 :-/