Function _mm256_permutexvar_epi8 

pub fn _mm256_permutexvar_epi8(idx: __m256i, a: __m256i) -> __m256i

Available on x86-64 and target feature avx512vbmi and target feature avx512vl only.

Shuffle 8-bit integers in a across lanes using the corresponding index in idx, and store the results in dst.

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