avx reset

[bitfaster]

Compare AVX to unrolled reset, without popcount:

Method	Size	Mean	Error	StdDev	Ratio
Reset1	4	9.151 ns	0.1928 ns	0.1804 ns	1.00
Reset2	4	6.342 ns	0.0821 ns	0.0768 ns	0.69
Reset4	4	6.270 ns	0.1115 ns	0.1043 ns	0.69
Reset4NoPopcount	4	4.205 ns	0.0570 ns	0.0505 ns	0.46
ResetAVXNoPopcount	4	2.800 ns	0.0373 ns	0.0349 ns	0.31
ResetAVXNoPopcountUnroll2	4	4.532 ns	0.0331 ns	0.0310 ns	0.50
ResetAVXNoPopcountUnroll4	4	4.750 ns	0.1034 ns	0.0967 ns	0.52
Reset1	128	283.191 ns	3.5599 ns	3.1558 ns	1.00
Reset2	128	179.379 ns	0.9743 ns	0.9114 ns	0.63
Reset4	128	162.091 ns	0.8050 ns	0.7530 ns	0.57
Reset4NoPopcount	128	105.598 ns	0.6973 ns	0.5823 ns	0.37
ResetAVXNoPopcount	128	21.846 ns	0.3369 ns	0.3152 ns	0.08
ResetAVXNoPopcountUnroll2	128	21.359 ns	0.0918 ns	0.0859 ns	0.08
ResetAVXNoPopcountUnroll4	128	16.176 ns	0.3352 ns	0.3725 ns	0.06
Reset1	8192	17,517.450 ns	122.9018 ns	114.9624 ns	1.00
Reset2	8192	10,969.356 ns	82.8480 ns	77.4961 ns	0.63
Reset4	8192	10,953.080 ns	65.4486 ns	58.0185 ns	0.63
Reset4NoPopcount	8192	6,815.917 ns	90.6199 ns	80.3322 ns	0.39
ResetAVXNoPopcount	8192	1,476.894 ns	12.3802 ns	10.9747 ns	0.08
ResetAVXNoPopcountUnroll2	8192	1,244.725 ns	4.9322 ns	4.1186 ns	0.07
ResetAVXNoPopcountUnroll4	8192	1,237.992 ns	9.3695 ns	8.7642 ns	0.07
Reset1	1048576	2,324,550.871 ns	29,512.8866 ns	24,644.5969 ns	1.00
Reset2	1048576	1,490,467.669 ns	13,307.7889 ns	12,448.1140 ns	0.64
Reset4	1048576	1,420,903.278 ns	9,196.8434 ns	8,152.7621 ns	0.61
Reset4NoPopcount	1048576	1,001,215.091 ns	19,047.1537 ns	19,560.0245 ns	0.43
ResetAVXNoPopcount	1048576	476,548.980 ns	8,520.8924 ns	12,489.8137 ns	0.21
ResetAVXNoPopcountUnroll2	1048576	431,470.897 ns	8,490.5386 ns	14,417.5790 ns	0.19
ResetAVXNoPopcountUnroll4	1048576	425,734.271 ns	8,506.6079 ns	17,943.3233 ns	0.18