Implement AVX512_FP16 #2249

Job	Run time
Check Style	18s
Test (i686-unknown-linux-gnu)	1m 51s
Build std_detect	1m 1s
Test (x86_64-unknown-linux-gnu)	3m 38s
Env Override (ubuntu-latest)	12s
Build Documentation	1m 14s
Test (x86_64-unknown-linux-gnu-emulated)	9m 20s
Env Override (windows-latest)	24s
Automatic intrinsic verification	27s
Test (arm-unknown-linux-gnueabihf)	1m 16s
Test (armv7-unknown-linux-gnueabihf)	10m 30s
Test (aarch64-unknown-linux-gnu)	20m 50s
Test (riscv64gc-unknown-linux-gnu)	1m 24s
Test (powerpc64le-unknown-linux-gnu)	3m 29s
Test (s390x-unknown-linux-gnu)	1m 29s
Test (wasm32-wasip1)	1m 21s
Test (i586-unknown-linux-gnu)	1m 53s
Test (nvptx64-nvidia-cuda)	33s
Test (thumbv6m-none-eabi)	14s
Test (thumbv7m-none-eabi)	14s
Test (thumbv7em-none-eabi)	13s
Test (thumbv7em-none-eabihf)	15s
Test (x86_64-apple-darwin)	6m 35s
Test (aarch64-apple-darwin)	55s
Test (x86_64-pc-windows-msvc)	6m 39s
Test (i686-pc-windows-msvc)	2m 53s
Test (aarch64-pc-windows-msvc)	1m 24s
Test (x86_64-pc-windows-gnu)	6m 52s
success	1s
	1h 27m 25s

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