[x265] [arm64] port sad_x{3,4}

[Pop, Sebastian]

Hi,

the attached patch ports to arm64 the following kernels:

         sad_x3[  4x4]  12.23x   13.79           168.68
         sad_x4[  4x4]  14.12x   15.82           223.43
         sad_x3[  8x8]  35.05x   17.45           611.47
         sad_x4[  8x8]  38.48x   21.18           814.95
         sad_x3[  8x4]  27.19x   11.46           311.48
         sad_x4[  8x4]  30.40x   13.60           413.37
         sad_x3[  4x8]  14.16x   22.99           325.37
         sad_x4[  4x8]  15.82x   27.39           433.23
         sad_x3[16x16]  40.94x   57.94           2371.97
         sad_x4[16x16]  43.63x   72.44           3160.44
         sad_x3[ 16x8]  38.84x   30.54           1186.15
         sad_x4[ 16x8]  39.23x   40.16           1575.43
         sad_x3[ 8x16]  38.74x   31.43           1217.71
         sad_x4[ 8x16]  41.48x   39.01           1618.17
         sad_x3[ 16x4]  31.82x   18.88           600.72
         sad_x4[ 16x4]  36.35x   21.87           795.00
         sad_x3[16x12]  40.27x   43.87           1766.74
         sad_x4[16x12]  42.58x   55.94           2381.75
         sad_x3[ 4x16]  15.34x   42.16           646.67
         sad_x4[ 4x16]  17.08x   51.06           872.12
         sad_x3[12x16]  29.45x   61.06           1798.28
         sad_x4[12x16]  30.39x   78.94           2399.17
         sad_x3[32x32]  42.85x   216.39          9272.65
         sad_x4[32x32]  42.53x   294.98          12544.76
         sad_x3[32x16]  42.09x   110.35          4644.86
         sad_x4[32x16]  41.71x   151.05          6301.01
         sad_x3[16x32]  44.19x   106.99          4728.04
         sad_x4[16x32]  44.72x   139.94          6257.96
         sad_x3[ 32x8]  40.10x   58.16           2332.47
         sad_x4[ 32x8]  41.17x   76.65           3155.96
         sad_x3[32x24]  42.69x   162.76          6947.64
        sad_x4[32x24]  42.08x   223.88          9421.46
         sad_x3[ 8x32]  41.86x   57.89           2423.47
         sad_x4[ 8x32]  45.26x   71.56           3239.07
         sad_x3[24x32]  45.10x   155.22          6999.53
         sad_x4[24x32]  45.30x   205.87          9325.60
         sad_x3[64x64]  39.87x   925.36          36892.50
         sad_x4[64x64]  40.80x   1214.79         49557.66
         sad_x3[64x32]  39.40x   468.08          18444.51
         sad_x4[64x32]  40.71x   609.27          24803.74
         sad_x3[32x64]  43.48x   426.05          18522.95
         sad_x4[32x64]  43.31x   577.80          25024.14
         sad_x3[64x16]  38.67x   238.72          9231.84
         sad_x4[64x16]  40.36x   308.10          12435.08
         sad_x3[64x48]  39.70x   695.95          27628.87
         sad_x4[64x48]  40.74x   912.56          37173.46
         sad_x3[16x64]  44.85x   208.19          9337.52
         sad_x4[16x64]  45.46x   274.68          12487.54
         sad_x3[48x64]  42.68x   653.74          27903.74
         sad_x4[48x64]  44.67x   835.79          37336.87

Ok to commit?

Thanks,
Sebastian

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