ARMv8 defines crc32 instruction.

Comparing to the original crc32 calculation, this patch makes use of
crc32 instructions to do crc32 calculation instead of the multiple
lookup table algorithms.

ARMv8 provides IEEE and Castagnoli polynomials for crc32 calculation
so that the perfomance of these two types of crc32 get significant
improved.

name                                        old time/op   new time/op    delta
CRC32/poly=IEEE/size=15/align=0-32            117ns ± 0%      38ns ± 0%   -67.44%
CRC32/poly=IEEE/size=15/align=1-32            117ns ± 0%      38ns ± 0%   -67.52%
CRC32/poly=IEEE/size=40/align=0-32            129ns ± 0%      41ns ± 0%   -68.37%
CRC32/poly=IEEE/size=40/align=1-32            129ns ± 0%      41ns ± 0%   -68.29%
CRC32/poly=IEEE/size=512/align=0-32           828ns ± 0%     246ns ± 0%   -70.29%
CRC32/poly=IEEE/size=512/align=1-32           828ns ± 0%     132ns ± 0%   -84.06%
CRC32/poly=IEEE/size=1kB/align=0-32          1.58µs ± 0%    0.46µs ± 0%   -70.98%
CRC32/poly=IEEE/size=1kB/align=1-32          1.58µs ± 0%    0.46µs ± 0%   -70.92%
CRC32/poly=IEEE/size=4kB/align=0-32          6.06µs ± 0%    1.74µs ± 0%   -71.27%
CRC32/poly=IEEE/size=4kB/align=1-32          6.10µs ± 0%    1.74µs ± 0%   -71.44%
CRC32/poly=IEEE/size=32kB/align=0-32         48.3µs ± 0%    13.7µs ± 0%   -71.61%
CRC32/poly=IEEE/size=32kB/align=1-32         48.3µs ± 0%    13.7µs ± 0%   -71.60%
CRC32/poly=Castagnoli/size=15/align=0-32      116ns ± 0%      38ns ± 0%   -67.07%
CRC32/poly=Castagnoli/size=15/align=1-32      116ns ± 0%      38ns ± 0%   -66.90%
CRC32/poly=Castagnoli/size=40/align=0-32      127ns ± 0%      40ns ± 0%   -68.11%
CRC32/poly=Castagnoli/size=40/align=1-32      127ns ± 0%      40ns ± 0%   -68.11%
CRC32/poly=Castagnoli/size=512/align=0-32     828ns ± 0%     132ns ± 0%   -84.06%
CRC32/poly=Castagnoli/size=512/align=1-32     827ns ± 0%     132ns ± 0%   -84.04%
CRC32/poly=Castagnoli/size=1kB/align=0-32    1.59µs ± 0%    0.22µs ± 0%   -85.89%
CRC32/poly=Castagnoli/size=1kB/align=1-32    1.58µs ± 0%    0.22µs ± 0%   -85.79%
CRC32/poly=Castagnoli/size=4kB/align=0-32    6.14µs ± 0%    0.77µs ± 0%   -87.40%
CRC32/poly=Castagnoli/size=4kB/align=1-32    6.06µs ± 0%    0.77µs ± 0%   -87.25%
CRC32/poly=Castagnoli/size=32kB/align=0-32   48.3µs ± 0%     5.9µs ± 0%   -87.71%
CRC32/poly=Castagnoli/size=32kB/align=1-32   48.4µs ± 0%     6.0µs ± 0%   -87.69%
CRC32/poly=Koopman/size=15/align=0-32         104ns ± 0%     104ns ± 0%    +0.00%
CRC32/poly=Koopman/size=15/align=1-32         104ns ± 0%     104ns ± 0%    +0.00%
CRC32/poly=Koopman/size=40/align=0-32         235ns ± 0%     235ns ± 0%    +0.00%
CRC32/poly=Koopman/size=40/align=1-32         235ns ± 0%     235ns ± 0%    +0.00%
CRC32/poly=Koopman/size=512/align=0-32       2.71µs ± 0%    2.71µs ± 0%    -0.07%
CRC32/poly=Koopman/size=512/align=1-32       2.71µs ± 0%    2.71µs ± 0%    -0.04%
CRC32/poly=Koopman/size=1kB/align=0-32       5.40µs ± 0%    5.39µs ± 0%    -0.06%
CRC32/poly=Koopman/size=1kB/align=1-32       5.40µs ± 0%    5.40µs ± 0%    +0.02%
CRC32/poly=Koopman/size=4kB/align=0-32       21.5µs ± 0%    21.5µs ± 0%    -0.16%
CRC32/poly=Koopman/size=4kB/align=1-32       21.5µs ± 0%    21.5µs ± 0%    -0.05%
CRC32/poly=Koopman/size=32kB/align=0-32       172µs ± 0%     172µs ± 0%    -0.07%
CRC32/poly=Koopman/size=32kB/align=1-32       172µs ± 0%     172µs ± 0%    -0.01%

name                                        old speed     new speed      delta
CRC32/poly=IEEE/size=15/align=0-32          128MB/s ± 0%   394MB/s ± 0%  +207.95%
CRC32/poly=IEEE/size=15/align=1-32          128MB/s ± 0%   394MB/s ± 0%  +208.09%
CRC32/poly=IEEE/size=40/align=0-32          310MB/s ± 0%   979MB/s ± 0%  +216.07%
CRC32/poly=IEEE/size=40/align=1-32          310MB/s ± 0%   979MB/s ± 0%  +216.16%
CRC32/poly=IEEE/size=512/align=0-32         618MB/s ± 0%  2074MB/s ± 0%  +235.72%
CRC32/poly=IEEE/size=512/align=1-32         618MB/s ± 0%  3852MB/s ± 0%  +523.55%
CRC32/poly=IEEE/size=1kB/align=0-32         646MB/s ± 0%  2225MB/s ± 0%  +244.57%
CRC32/poly=IEEE/size=1kB/align=1-32         647MB/s ± 0%  2225MB/s ± 0%  +243.87%
CRC32/poly=IEEE/size=4kB/align=0-32         676MB/s ± 0%  2352MB/s ± 0%  +248.02%
CRC32/poly=IEEE/size=4kB/align=1-32         672MB/s ± 0%  2352MB/s ± 0%  +250.15%
CRC32/poly=IEEE/size=32kB/align=0-32        678MB/s ± 0%  2387MB/s ± 0%  +252.17%
CRC32/poly=IEEE/size=32kB/align=1-32        678MB/s ± 0%  2388MB/s ± 0%  +252.11%
CRC32/poly=Castagnoli/size=15/align=0-32    129MB/s ± 0%   393MB/s ± 0%  +205.51%
CRC32/poly=Castagnoli/size=15/align=1-32    129MB/s ± 0%   390MB/s ± 0%  +203.41%
CRC32/poly=Castagnoli/size=40/align=0-32    314MB/s ± 0%   988MB/s ± 0%  +215.04%
CRC32/poly=Castagnoli/size=40/align=1-32    314MB/s ± 0%   987MB/s ± 0%  +214.68%
CRC32/poly=Castagnoli/size=512/align=0-32   618MB/s ± 0%  3860MB/s ± 0%  +524.32%
CRC32/poly=Castagnoli/size=512/align=1-32   619MB/s ± 0%  3859MB/s ± 0%  +523.66%
CRC32/poly=Castagnoli/size=1kB/align=0-32   645MB/s ± 0%  4568MB/s ± 0%  +608.56%
CRC32/poly=Castagnoli/size=1kB/align=1-32   650MB/s ± 0%  4567MB/s ± 0%  +602.94%
CRC32/poly=Castagnoli/size=4kB/align=0-32   667MB/s ± 0%  5297MB/s ± 0%  +693.81%
CRC32/poly=Castagnoli/size=4kB/align=1-32   676MB/s ± 0%  5297MB/s ± 0%  +684.00%
CRC32/poly=Castagnoli/size=32kB/align=0-32  678MB/s ± 0%  5519MB/s ± 0%  +713.83%
CRC32/poly=Castagnoli/size=32kB/align=1-32  677MB/s ± 0%  5497MB/s ± 0%  +712.04%
CRC32/poly=Koopman/size=15/align=0-32       143MB/s ± 0%   144MB/s ± 0%    +0.27%
CRC32/poly=Koopman/size=15/align=1-32       143MB/s ± 0%   144MB/s ± 0%    +0.33%
CRC32/poly=Koopman/size=40/align=0-32       169MB/s ± 0%   170MB/s ± 0%    +0.12%
CRC32/poly=Koopman/size=40/align=1-32       170MB/s ± 0%   170MB/s ± 0%    +0.08%
CRC32/poly=Koopman/size=512/align=0-32      189MB/s ± 0%   189MB/s ± 0%    +0.07%
CRC32/poly=Koopman/size=512/align=1-32      189MB/s ± 0%   189MB/s ± 0%    +0.04%
CRC32/poly=Koopman/size=1kB/align=0-32      190MB/s ± 0%   190MB/s ± 0%    +0.05%
CRC32/poly=Koopman/size=1kB/align=1-32      190MB/s ± 0%   190MB/s ± 0%    -0.01%
CRC32/poly=Koopman/size=4kB/align=0-32      190MB/s ± 0%   190MB/s ± 0%    +0.15%
CRC32/poly=Koopman/size=4kB/align=1-32      190MB/s ± 0%   191MB/s ± 0%    +0.05%
CRC32/poly=Koopman/size=32kB/align=0-32     191MB/s ± 0%   191MB/s ± 0%    +0.06%
CRC32/poly=Koopman/size=32kB/align=1-32     191MB/s ± 0%   191MB/s ± 0%    +0.02%

Also fix a bug of arm64 assembler

The optimization is mainly contributed by Fangming.Fang <fangming.fang@arm.com>

Change-Id: I900678c2e445d7e8ad9e2a9ab3305d649230905f
Reviewed-on: https://go-review.googlesource.com/40074Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>