Function `_mm256_mask_permutexvar_pd`

#[target_feature(enable = "avx512f", enable = "avx512vl")]
pub fn _mm256_mask_permutexvar_pd(src: __m256d, k: __mmask8, idx: __m256i, a: __m256d) -> __m256d

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

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