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Convert use of MMX to SSE2, also remove the SSSE3 impl. since we no longer use palignr Before: pred8x8l_down_left_8_sse2: 18.0 ( 4.04x) pred8x8l_down_left_8_ssse3: 16.2 ( 4.49x) After: pred8x8l_down_left_8_sse2: 14.2 ( 5.14x) Signed-off-by: Zuxy Meng <zuxy.meng@gmail.com>