AVX512 intrinsics / stdsimd

I'm hoping to use some AVX 512 intrinsics in stable Rust and am wondering what the path to doing that would look like. The existing AVX 512 intrinsics are guarded behind the stdsimd feature, which seems to be currently abandoned. I have added the intrinsics I'm interested in to stdarch and have a PR out to get those into nightly. I'm happy to do additional work to get towards stabilization, but I currently have no perspective on what the bar / path would be like.

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