More intra pred asm optimizations
SSSE3 version of predict_8x8_hu SSE2 version of predict_8x8c_p SSSE3 versions of both planar prediction functions Optimizations to predict_16x16_p_sse2 Some unnecessary REP_RETs -> RETs. SSE2 version of predict_8x8_vr by Holger. SSE2 version of predict_8x8_hd. Don't compile MMX versions of some of the pred functions on x86_64. Remove now-useless x86_64 C versions of 4x4 pred functions. Rewrite some of the x86_64-only C functions in asm.
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