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This improves Adler-32 performance on large inputs:
CPU Old (GB/s) New (GB/s)
========= ========== ==========
Apple M1 51.5 61.1
Cortex-X1 34.2 45.2
Cortex-A78 16.9 23.3
Cortex-A76 18.2 23.1
Cortex-A55 2.4 4.1
This roughly follows the approach of the old AVX-2 implementation, which
I recently changed to a different approach. But vdotq_u32 (the udot
instruction) makes the approach work well on arm64.
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