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x86: Add chroma-from-luma AC 4:2:2 AVX2 asm

David Michael Barr requested to merge barrbrain/dav1d:cfl-ac-asm into master
cfl_ac_422_w4_8bpc_c: 323.2
cfl_ac_422_w4_8bpc_avx2: 35.7
cfl_ac_422_w8_8bpc_c: 687.1
cfl_ac_422_w8_8bpc_avx2: 41.4
cfl_ac_422_w16_8bpc_c: 983.2
cfl_ac_422_w16_8bpc_avx2: 62.8

For reference, 4:2:0 results on the same machine:

cfl_ac_420_w4_8bpc_c: 378.7
cfl_ac_420_w4_8bpc_avx2: 43.7
cfl_ac_420_w8_8bpc_c: 527.3
cfl_ac_420_w8_8bpc_avx2: 40.8
cfl_ac_420_w16_8bpc_c: 794.1
cfl_ac_420_w16_8bpc_avx2: 56.5

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