Enable `stdarch_x86_avx512` for cpu has `avx512bw` #1215

Job	Run time
Check Clippy and rustfmt	22s
Check doc	35s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	1m 22s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	1m 8s
test (macos-latest, x86_64-apple-darwin, stable)	1m 13s
test-ios	23s
test (windows-latest, x86_64-pc-windows-gnu, stable)	1m 58s
test-miri	5m 6s
test-no-std	13s
test (windows-latest, x86_64-pc-windows-msvc, beta)	2m 15s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.63.0)	2m 32s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	1m 48s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	1m 1s
	19m 56s

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