[x265] [arm64] port sse_{ss,pp} and ssd_s

[Pop, Sebastian]

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

         sse_pp[  4x4]  13.27x   6.83            90.66
         sse_ss[  4x4]  13.69x   7.04            96.40
         sse_pp[  8x8]  27.13x   12.64           343.05
         sse_ss[  8x8]  28.94x   12.71           367.81
  [i420] sse_pp[  4x4]  12.81x   7.08            90.61
  [i422] sse_pp[  4x8]  19.01x   9.45            179.58
         sse_pp[16x16]  37.61x   36.69           1379.72
         sse_ss[16x16]  39.30x   37.74           1482.94
  [i420] sse_pp[  8x8]  26.24x   13.10           343.74
  [i422] sse_pp[ 8x16]  33.71x   20.88           703.93
         sse_pp[32x32]  37.64x   145.17          5464.50
         sse_ss[32x32]  40.42x   145.60          5885.51
  [i420] sse_pp[16x16]  37.45x   36.93           1383.13
  [i422] sse_pp[16x32]  40.86x   67.42           2755.01
         sse_pp[64x64]  38.68x   566.98          21929.08
         sse_ss[64x64]  41.31x   568.08          23465.16
  [i420] sse_pp[32x32]  37.60x   145.30          5462.52
  [i422] sse_pp[32x64]  38.10x   286.07          10898.57
            ssd_s[4x4]  10.42x   6.41            66.77
            ssd_s[8x8]  23.52x   10.84           255.06
          ssd_s[16x16]  30.44x   33.62           1023.40
          ssd_s[32x32]  31.65x   128.51          4067.63

Ok to commit?

Thanks,
Sebastian


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