Function _mm_permutex2var_epi8

#[target_feature(enable = "avx512vbmi", enable = "avx512vl")]
pub fn _mm_permutex2var_epi8(a: __m128i, idx: __m128i, b: __m128i) -> __m128i

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

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