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Deprecate MMX. Remove the SSSE3 impl. since we no longer use palignr. The SSE2 impl. uses several more instructions but is slightly faster. pred8x8l_dc_8_mmxext: 20.5 ( 1.66x) pred8x8l_dc_8_ssse3: 17.9 ( 1.90x) pred8x8l_dc_8_sse2: 15.9 ( 2.15x) Signed-off-by: Zuxy Meng <zuxy.meng@gmail.com>