[Bug target/65744] Some AVX512 instrinsics take __mmask16 instead of __mmask8

[kyukhin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65744

--- Comment #1 from Kirill Yukhin <kyukhin at gcc dot gnu.org> ---
Could be reproduced with:
 make -k check-gcc RUNTESTFLAGS="i386.exp=avx512f-vaddpd-1.c
--target_board=unix/-Werror/-Wsystem-headers/-Wconversion"