Function _mm512_mask2_permutex2var_pd

#[target_feature(enable = "avx512f")]
pub fn _mm512_mask2_permutex2var_pd(a: __m512d, idx: __m512i, k: __mmask8, b: __m512d) -> __m512d

Shuffle double-precision (64-bit) floating-point elements in a and b across lanes using the corresponding selector and index in idx, and store the results in dst using writemask k (elements are copied from idx when the corresponding mask bit is not set)

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