Function `_mm512_maskz_permutex2var_pd`

#[target_feature(enable = "avx512f")]
pub fn _mm512_maskz_permutex2var_pd(k: __mmask8, a: __m512d, idx: __m512i, 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 zeromask k (elements are zeroed out when the corresponding mask bit is not set).

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