[x265] [arm64] port luma_hpp

[Pop, Sebastian]

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

luma_hpp[  4x4]         6.62x    70.31           465.57
luma_hpp[  8x8]         13.73x   134.46          1845.80
luma_hpp[16x16]         15.15x   481.85          7302.42
luma_hpp[32x32]         15.92x   1857.16         29568.30
luma_hpp[64x64]         16.56x   7106.80         117723.80
luma_hpp[  8x4]         13.22x   70.13           927.30
luma_hpp[  4x8]         6.85x    136.53          935.87
luma_hpp[ 16x8]         14.78x   246.06          3635.85
luma_hpp[ 8x16]         14.10x   262.56          3701.81
luma_hpp[32x16]         16.06x   917.04          14729.45
luma_hpp[16x32]         15.29x   961.23          14694.73
luma_hpp[64x32]         16.40x   3590.07         58883.16
luma_hpp[32x64]         16.02x   3691.95         59153.97
luma_hpp[16x12]         15.14x   363.18          5496.85
luma_hpp[12x16]         11.45x   478.71          5482.72
luma_hpp[ 16x4]         14.42x   125.28          1806.93
luma_hpp[ 4x16]         6.92x    269.02          1862.02
luma_hpp[32x24]         15.94x   1392.68         22205.81
luma_hpp[24x32]         16.06x   1389.21         22306.88
luma_hpp[ 32x8]         15.94x   462.55          7370.89
luma_hpp[ 8x32]         14.21x   519.89          7385.71
luma_hpp[64x48]         16.12x   5465.88         88092.30
luma_hpp[48x64]         16.13x   5473.27         88301.40
luma_hpp[64x16]         16.12x   1825.85         29437.21
luma_hpp[16x64]         15.48x   1891.90         29293.72

Ok to commit?

Thanks,
Sebastian
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