Function _mm512_mask_shrdi_epi16

#[target_feature(enable = "avx512vbmi2")]
pub const fn _mm512_mask_shrdi_epi16(src: __m512i, k: __mmask32, a: __m512i, b: __m512i, IMM8: i32) -> __m512i

Concatenate packed 16-bit integers in b and a producing an intermediate 32-bit result. Shift the result right by imm8 bits, and store the lower 16-bits in dst using writemask k (elements are copied from src when the corresponding mask bit is not set).

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