Function `_mm512_mask_fnmadd_pd`

#[target_feature(enable = "avx512f")]
pub const fn _mm512_mask_fnmadd_pd(a: __m512d, k: __mmask8, b: __m512d, c: __m512d) -> __m512d

Multiply packed double-precision (64-bit) floating-point elements in a and b, add the negated intermediate result to packed elements in c, and store the results in dst using writemask k (elements are copied from a when the corresponding mask bit is not set).

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