Optimize CRC intrinisics for targets lacking of CRC extension #28

Job	Run time
host-win-msvc	1m 40s
host-arm (armv7, none, none, g++-10)	3m 42s
coding-style	19s
host-win (x86_64)	1m 2s
host-arm (armv7, none, none, clang++-11)	4m 56s
host-x86 (x86_64, g++-10)	1m 55s
host-win (armv7)	42s
host-arm (aarch64, none, none, g++-10)	3m 5s
host-x86 (x86_64, clang++-11)	21s
host-win (aarch64)	38s
host-arm (aarch64, none, none, clang++-11)	3m 33s
host-arm (aarch64, crypto+crc, none, g++-10)	3m 7s
host-arm (aarch64, crypto+crc, none, clang++-11)	3m 45s
host-arm (armv7, none, -mcpu=cortex-a32 -mfpu=neon-fp-armv8, g++-10)	3m 39s
host-arm (armv7, none, -mcpu=cortex-a32 -mfpu=neon-fp-armv8, clang++-11)	3m 41s
test-win-msvc	54s
	36m 59s

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