vendor agnostic #5
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second pass at KA: 
num threads hard-coded at 32 in the first (only) dimension to maximize block utilization mostly alleviates regression in |
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fixes #1.
not merged yet because benchmarks are slower by ~10%:
the huge regression in
batched_dotcan partially be fixed by specifyingCUDABackend(prefer_blocks=true), but this then is not vendor agnostic. see https://discourse.julialang.org/t/kernelabstractions-get-backend-keyword-arguments/97895