Function _mm256_maskz_fmul_pch

#[target_feature(enable = "avx512fp16", enable = "avx512vl")]
pub fn _mm256_maskz_fmul_pch(k: __mmask8, a: __m256h, b: __m256h) -> __m256h

Multiply packed complex numbers in a and b, and store the results in dst using zeromask k (the element is zeroed out 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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