Function _mm512_permutex2var_epi16

#[target_feature(enable = "avx512bw")]
pub fn _mm512_permutex2var_epi16(a: __m512i, idx: __m512i, b: __m512i) -> __m512i

Shuffle 16-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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