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Use some 8 bit arithmetic in AVX2 CDEF filter

Kyle Siefring requested to merge KyleSiefring/dav1d:cdef_8bit_arithmetic into master

Before:

cdef_filter_8x8_8bpc_avx2: 252.3
cdef_filter_4x8_8bpc_avx2: 182.1
cdef_filter_4x4_8bpc_avx2: 105.7

After:

cdef_filter_8x8_8bpc_avx2: 235.5
cdef_filter_4x8_8bpc_avx2: 174.8
cdef_filter_4x4_8bpc_avx2: 101.8

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