Function _mm_mask_fmul_pch

#[target_feature(enable = "avx512fp16", enable = "avx512vl")]
pub fn _mm_mask_fmul_pch(src: __m128h, k: __mmask8, a: __m128h, b: __m128h) -> __m128h

Multiply packed complex numbers in a and b, and store the results in dst using writemask k (the element is copied from src when corresponding mask bit is not set). Each complex number is composed of two adjacent half-precision (16-bit) floating-point elements, which defines the complex number complex = vec.fp16[0] + i * vec.fp16[1].

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