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Add arm64 neon implementations for hscale 16 to 15 with filter sizes 4, 8 and X4. The tests and benchmarks run on AWS Graviton 2 instances. The results from a checkasm tool are shown below. hscale_16_to_15__fs_4_dstW_512_c: 6703.5 hscale_16_to_15__fs_4_dstW_512_neon: 2298.0 hscale_16_to_15__fs_8_dstW_512_c: 10983.0 hscale_16_to_15__fs_8_dstW_512_neon: 3216.5 hscale_16_to_15__fs_12_dstW_512_c: 15526.0 hscale_16_to_15__fs_12_dstW_512_neon: 3993.0 hscale_16_to_15__fs_16_dstW_512_c: 20183.5 hscale_16_to_15__fs_16_dstW_512_neon: 5369.7 hscale_16_to_15__fs_32_dstW_512_c: 39315.2 hscale_16_to_15__fs_32_dstW_512_neon: 9511.2 hscale_16_to_15__fs_40_dstW_512_c: 48995.7 hscale_16_to_15__fs_40_dstW_512_neon: 11570.0 (Note, the checkasm tests for these functions haven't been merged since they fail on x86.) Signed-off-by: Hubert Mazur <hum@semihalf.com> Signed-off-by: Martin Storsjö <martin@martin.st>