std_detect: add avx512fp16 #1958

Job	Run time
Check Style	15s
Build Documentation	1m 9s
Build std_detect	1m 0s
Test (i686-unknown-linux-gnu)	1m 39s
Automatic intrinsic verification	27s
Test (x86_64-unknown-linux-gnu)	3m 31s
Env Override	12s
Test (x86_64-unknown-linux-gnu-emulated)	9m 11s
Test (arm-unknown-linux-gnueabihf)	1m 34s
Test (armv7-unknown-linux-gnueabihf)	10m 40s
Test (aarch64-unknown-linux-gnu)	21m 44s
Test (riscv64gc-unknown-linux-gnu)	1m 15s
Test (powerpc64le-unknown-linux-gnu)	3m 36s
Test (s390x-unknown-linux-gnu)	1m 22s
Test (wasm32-wasi)	1m 31s
Test (i586-unknown-linux-gnu)	1m 41s
Test (nvptx64-nvidia-cuda)	41s
Test (thumbv6m-none-eabi)	11s
Test (thumbv7m-none-eabi)	15s
Test (thumbv7em-none-eabi)	15s
Test (thumbv7em-none-eabihf)	14s
Test (aarch64-apple-darwin)	1m 50s
Test (x86_64-pc-windows-msvc)	6m 13s
Test (i686-pc-windows-msvc)	2m 43s
Test (x86_64-apple-darwin, macos-11)	9m 5s
success	1s
	1h 22m 15s

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