add an avx512 psadbw shim
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also combine the sse2 and avx2 version into one generic function for all 3
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I added a more interesting test than what stdarch has, this new test was tested on real hardware. |
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One more for the zlib-rs adler32 implementation.
The code for sse2, avx2 and avx512 is basically identical, so I centralized the implementation.