add AVX-512 compress/compress_xof #912

Job	Run time
C Makefile tests	2m 26s
build for Apple Silicon	1m 2s
b3sum Linux GNU stable	39s
b3sum Linux GNU beta	42s
b3sum Linux GNU nightly	36s
b3sum Linux GNU 1.66.1	1m 21s
b3sum macOS stable	1m 8s
b3sum macOS beta	1m 7s
b3sum macOS nightly	1m 3s
b3sum macOS 1.66.1	1m 45s
b3sum Windows MSVC stable	1m 35s
b3sum Windows MSVC beta	1m 14s
b3sum Windows MSVC nightly	1m 28s
b3sum Windows MSVC 1.66.1	2m 27s
b3sum Windows GNU stable	1m 40s
b3sum Windows GNU beta	1m 37s
b3sum Windows GNU nightly	1m 33s
b3sum Windows GNU 1.66.1	2m 9s
build with the Tiny C Compiler	17s
CMake ubuntu-latest	27s
CMake ubuntu-latest	6s
CMake ubuntu-latest	5s
CMake macOS-latest	17s
CMake macOS-latest	15s
CMake macOS-latest	15s
CMake windows-latest	54s
CMake windows-latest	1m 31s
cross i586-unknown-linux-musl	1m 58s
cross i686-unknown-linux-musl	2m 25s
cross armv7-unknown-linux-gnueabihf	1m 56s
cross aarch64-unknown-linux-gnu	2m 1s
cross mips-unknown-linux-gnu	1m 54s
compile and test with GCC 5.4	1m 7s
Linux GNU stable	31s
Linux GNU beta	35s
Linux GNU nightly	29s
Linux GNU 1.66.1	1m 26s
macOS stable	51s
macOS beta	53s
macOS nightly	1m 9s
macOS 1.66.1	1m 40s
Windows MSVC stable	1m 19s
Windows MSVC beta	1m 50s
Windows MSVC nightly	1m 12s
Windows MSVC 1.66.1	2m 3s
Windows GNU stable	1m 24s
Windows GNU beta	1m 54s
Windows GNU nightly	1m 23s
Windows GNU 1.66.1	2m 24s
	1h 2m 3s

Provide feedback