[x265] [arm64] port count_nonzero, blkfill, and copy_{ss, sp, ps}

[Pop, Sebastian]

> @@ -508,19 +508,17 @@ function x265_copy_cnt_4_neon
> ......
> +    uaddlv          s4, v4.4h
> Unsigned?

Thanks for catching this.
The attached patch fixes the problem and gets a little more speedup:

Before:
         copy_cnt[4x4]  14.76x   7.12            105.12
         copy_cnt[8x8]  37.56x   10.60           398.25
       copy_cnt[16x16]  52.57x   29.74           1563.60
       copy_cnt[32x32]  62.22x   98.37           6120.29

After:
         copy_cnt[4x4]  15.28x   6.87            104.93
         copy_cnt[8x8]  38.20x   10.32           394.19
       copy_cnt[16x16]  52.40x   29.90           1566.65
       copy_cnt[32x32]  62.67x   97.81           6130.08
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