Optimize CRC intrinisics for targets lacking of CRC extension #30

Job	Run time
host-win (x86_64)	40s
host-win-msvc	1m 25s
host-x86 (x86_64, g++-10)	2m 6s
host-arm (armv7, none, none, g++-10)	3m 16s
host-win (armv7)	1m 2s
host-x86 (x86_64, clang++-11)	24s
host-arm (armv7, none, none, clang++-11)	3m 20s
host-win (aarch64)	40s
host-arm (aarch64, none, none, g++-10)	2m 42s
host-arm (aarch64, none, none, clang++-11)	4m 10s
coding-style	12s
host-arm (aarch64, crypto+crc, none, g++-10)	2m 55s
host-arm (aarch64, crypto+crc, none, clang++-11)	3m 37s
host-arm (armv7, none, -mcpu=cortex-a32 -mfpu=neon-fp-armv8, g++-10)	3m 7s
host-arm (armv7, none, -mcpu=cortex-a32 -mfpu=neon-fp-armv8, clang++-11)	3m 24s
test-win-msvc	49s
	33m 49s

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