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Cherry-pick ad0646cb Slow pshufb removal in 3 intra prediction functions. Replaced aom_d45_predictor_4x4_ssse3(), aom_d45_predictor_8x8_ssse3() and aom_d207_predictor_4x4_ssse3() with created aom_d45_predictor_4x4_sse2(), aom_d45_predictor_8x8_sse2() and aom_d207_predictor_4x4_sse2() respectively. It's mostly neutral or slightly worse than ssse3 in good cases and better than ssse3 in the bad cases (but still worse than using the mmx regs). Change-Id: I40ef101cd8b2f20eaa3f0648536bd227c7ae9722
36b4949e