Function _mm512_mask_shldv_epi64
#[target_feature(enable = "avx512vbmi2")]
pub const fn _mm512_mask_shldv_epi64(a: __m512i, k: __mmask8, b: __m512i, c: __m512i) -> __m512iConcatenate packed 64-bit integers in a and b producing an intermediate 128-bit result. Shift the result left by the amount specified in the corresponding element of c, and store the upper 64-bits in dst using writemask k (elements are copied from a when the corresponding mask bit is not set).