[x265] [arm64] port filterPixelToShort

[Pop, Sebastian]

Hi,

The attached patch ports filterPixelToShort to arm64.
Tested on graviton2 arm64-linux.

convert_p2s[  4x4]              1.21x    4.98            6.03
convert_p2s[  8x8]              2.20x    6.20            13.65
convert_p2s[16x16]              1.54x    25.24           38.94
convert_p2s[32x32]              1.49x    101.99          151.63
convert_p2s[64x64]              1.48x    420.31          622.36
convert_p2s[  8x4]              2.18x    3.05            6.64
convert_p2s[  4x8]              1.91x    6.01            11.49
convert_p2s[ 16x8]              1.47x    12.19           17.92
convert_p2s[ 8x16]              1.95x    13.30           25.94
convert_p2s[32x16]              1.49x    50.63           75.58
convert_p2s[16x32]              1.56x    49.92           77.66
convert_p2s[64x32]              1.49x    209.43          312.13
convert_p2s[32x64]              1.48x    205.16          304.53
convert_p2s[16x12]              1.65x    17.62           29.08
convert_p2s[12x16]              6.22x    24.07           149.61
convert_p2s[ 16x4]              1.60x    5.37            8.59
convert_p2s[ 4x16]              1.75x    13.58           23.73
convert_p2s[32x24]              1.48x    76.47           113.22
convert_p2s[24x32]              2.69x    78.12           210.52
convert_p2s[ 32x8]              1.48x    25.00           37.06
convert_p2s[ 8x32]              1.63x    29.10           47.46
convert_p2s[64x48]              1.48x    314.74          466.77
convert_p2s[64x16]              1.48x    104.13          154.48
convert_p2s[16x64]              1.58x    98.66           155.67

Ok to commit?

Thanks,
Sebastian
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