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Removing postproc mmx code.
Dmitry Kovalev authored
Removed functions:
* vp9_post_proc_down_and_across_mmx
* vp9_mbpost_proc_down_mmx
* vp9_plane_add_noise_mmx

They all have sse2 equivalent.

Change-Id: I59c1fac12b7c96ca4538d455e4400c2b7875feff
1100e262