[Bug c++/84783] Missing _mm256_permutexvar_epi64() intrinsic for AVX512VL

[sebastian.peryt at intel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84783

--- Comment #3 from Sebastian Peryt <sebastian.peryt at intel dot com> ---
Proposed patch sent to list
https://gcc.gnu.org/ml/gcc-patches/2018-03/msg01181.html