[x265] [arm64] port sad

[Pop, Sebastian]

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

            sad[  4x4]  10.11x   6.50            65.72
            sad[  8x8]  28.95x   8.50            246.00
            sad[  8x4]  23.03x   5.45            125.43
            sad[  4x8]  12.09x   10.64           128.68
            sad[16x16]  53.37x   19.19           1024.05
            sad[ 16x8]  43.09x   11.62           500.84
            sad[ 8x16]  31.03x   16.87           523.44
            sad[ 16x4]  39.73x   6.27            249.10
            sad[16x12]  50.55x   15.10           763.44
            sad[ 4x16]  14.23x   19.39           275.91
            sad[12x16]  33.68x   22.95           772.81
            sad[32x32]  62.10x   64.84           4026.97
            sad[32x16]  59.82x   33.74           2018.56
            sad[16x32]  57.94x   35.01           2028.17
            sad[ 32x8]  53.98x   18.77           1013.48
            sad[32x24]  61.29x   49.36           3024.90
            sad[ 8x32]  31.84x   32.49           1034.56
            sad[24x32]  53.61x   56.39           3022.97
            sad[64x64]  65.24x   255.86          16692.29
            sad[64x32]  61.77x   131.16          8100.90
            sad[32x64]  62.31x   128.90          8031.79
            sad[64x16]  60.28x   67.35           4060.31
            sad[64x48]  62.53x   193.59          12104.64
            sad[16x64]  61.10x   66.13           4040.26
            sad[48x64]  61.75x   194.68          12022.14

Ok to commit?

Thanks,
Sebastian

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