Function _kshiftri_mask64

pub fn _kshiftri_mask64(a: __mmask64, const COUNT: u32) -> __mmask64

Available on (x86 or x86-64) and target feature avx512bw and x86 only.

Shift the bits of 64-bit mask a right by count while shifting in zeros, and store the least significant 32 bits of the result in k.

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