Enable stdarch_x86_avx512 for cpu has avx512bw
#1551
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Motivation
Enable feature
stdarch_x86_avx512for cpu hasavx512bwwhensimd_supportis enabled.Details
The trait
WideningMultiplyforu16x32needavx512, which needs unstable library featurestdarch_x86_avx512. This modification enable it when cpu has target_featureavx512bw.