[x265] [arm64] port addAvg

[Pop, Sebastian]

Hi,
the attached patch ports to arm64 the following kernels:

             addAvg[  4x4]  22.03x   9.87            217.35
             addAvg[  8x8]  41.06x   21.01           862.77
     [i420]  addAvg[  4x4]  21.07x   10.31           217.20
     [i422]  addAvg[  4x8]  23.19x   17.87           414.44
             addAvg[  8x4]  35.10x   12.46           437.40
     [i420]  addAvg[  4x2]  13.23x   8.01            105.94
             addAvg[  4x8]  23.17x   17.89           414.54
             addAvg[16x16]  50.38x   63.28           3187.50
     [i420]  addAvg[  8x8]  38.47x   21.93           843.59
     [i422]  addAvg[ 8x16]  44.45x   38.55           1713.69
             addAvg[ 16x8]  47.63x   33.70           1605.09
     [i420]  addAvg[  8x4]  34.13x   12.86           439.01
     [i422]  addAvg[  8x8]  39.22x   21.87           857.94
             addAvg[ 8x16]  42.08x   40.88           1720.30
     [i420]  addAvg[  4x8]  23.03x   17.93           413.10
     [i422]  addAvg[ 4x16]  24.58x   32.44           797.45
             addAvg[ 16x4]  44.62x   18.13           809.08
     [i420]  addAvg[  8x2]  28.08x   8.17            229.29
     [i422]  addAvg[  8x4]  34.00x   12.82           435.82
             addAvg[16x12]  50.69x   48.05           2435.74
     [i420]  addAvg[  8x6]  38.48x   17.07           656.91
     [i422]  addAvg[ 8x12]  42.95x   30.00           1288.53
             addAvg[ 4x16]  25.31x   31.73           802.95
             addAvg[12x16]  35.76x   67.70           2421.01
     [i420]  addAvg[  6x8]  19.93x   30.26           603.15
     [i422]  addAvg[ 6x16]  20.47x   57.31           1172.97
             addAvg[32x32]  48.23x   254.84          12291.57
     [i420]  addAvg[16x16]  49.59x   63.82           3164.65
     [i422]  addAvg[16x32]  51.79x   123.15          6377.69
             addAvg[32x16]  49.46x   128.27          6343.50
     [i420]  addAvg[ 16x8]  48.03x   33.75           1620.91
     [i422]  addAvg[16x16]  50.35x   62.86           3164.73
             addAvg[16x32]  51.75x   122.50          6339.62
     [i420]  addAvg[ 8x16]  43.78x   38.62           1690.74
     [i422]  addAvg[ 8x32]  45.53x   72.44           3298.22
             addAvg[ 32x8]  47.93x   65.87           3156.92
     [i420]  addAvg[ 16x4]  43.43x   18.64           809.56
     [i422]  addAvg[ 16x8]  47.47x   33.64           1596.84
             addAvg[32x24]  49.16x   191.04          9392.00
     [i420]  addAvg[16x12]  49.27x   48.68           2398.20
     [i422]  addAvg[16x24]  50.96x   93.21           4750.37
             addAvg[ 8x32]  45.61x   72.32           3298.91
     [i420]  addAvg[ 4x16]  24.65x   32.30           796.37
     [i422]  addAvg[ 4x32]  25.97x   60.57           1572.78
             addAvg[24x32]  46.28x   204.88          9481.85
     [i420]  addAvg[12x16]  35.58x   68.07           2422.33
     [i422]  addAvg[12x32]  37.35x   130.66          4879.55
             addAvg[64x64]  45.30x   1066.50         48309.83
     [i420]  addAvg[32x32]  48.17x   255.22          12293.77
     [i422]  addAvg[32x64]  48.67x   505.28          24591.01
             addAvg[64x32]  45.22x   535.51          24215.25
     [i420]  addAvg[32x16]  48.63x   130.26          6334.18
     [i422]  addAvg[32x32]  48.33x   255.33          12341.31
             addAvg[32x64]  48.88x   504.10          24641.61
     [i420]  addAvg[16x32]  51.87x   123.09          6384.44
     [i422]  addAvg[16x64]  53.21x   242.70          12914.20
             addAvg[64x16]  44.87x   270.22          12125.58
     [i420]  addAvg[ 32x8]  46.57x   66.57           3100.05
     [i422]  addAvg[32x16]  48.76x   129.97          6336.97
             addAvg[64x48]  46.57x   800.90          37301.68
     [i420]  addAvg[32x24]  49.21x   192.49          9473.39
     [i422]  addAvg[32x48]  49.02x   379.97          18627.41
             addAvg[16x64]  53.24x   242.72          12922.55
     [i420]  addAvg[ 8x32]  44.63x   74.53           3326.18
     [i422]  addAvg[ 8x64]  48.12x   138.94          6686.57
             addAvg[48x64]  47.97x   754.41          36187.82
     [i420]  addAvg[24x32]  45.60x   205.26          9360.26
     [i422]  addAvg[24x64]  45.69x   408.96          18684.47

Ok to commit?

Thanks,
Sebastian

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