Function _mm256_mask2_permutex2var_ps
#[target_feature(enable = "avx512f", enable = "avx512vl")]
pub fn _mm256_mask2_permutex2var_ps(a: __m256, idx: __m256i, k: __mmask8, b: __m256) -> __m256Shuffle single-precision (32-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).