CPU: workaround avx512 4bit dequantize accuracy issue for large blocksize #1828
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This PR fixes 8 failing tests for 4bit dequantization on CPUs with AVX512F support.
There is an accuracy issue for the AVX512 codepath with fp16/fp32 and blocksize 2048 or 4096. This is an unlikely usecase, and as such we can accept to fallback all the way to the slower PyTorch implementation instead of a more complex fallback to a scalar C++ kernel.