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Allow checking zeromv mode in vp9_pick_inter_mode

This improves the compression performance of speed -5 by 0.6%. The
speed impact is less than 1%.

Change-Id: Ie77daa561976dfc8b479061e1221bdf428eb0c3b

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -599,8 +599,7 @@

       int rate_mv = 0;

       int mode_rd_thresh;

-      if (const_motion[ref_frame] &&

-          (this_mode == NEARMV || this_mode == ZEROMV))

+      if (const_motion[ref_frame] && this_mode == NEARMV)

         continue;

       if (!(cpi->sf.inter_mode_mask[bsize] & (1 << this_mode)))