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Skip checking compound modes with same sign bias for sub8x8

Drop the check of compound modes where the two reference frames
share the same reference frame sign bias in sub8x8 coding blocks.

Change-Id: I47b45256582b2b5ea1372c9130d8f28cd226a29c

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -3985,6 +3985,11 @@

     comp_pred = second_ref_frame > INTRA_FRAME;

     if (comp_pred) {

       if (!cpi->allow_comp_inter_inter) continue;

+

+      if (cm->ref_frame_sign_bias[ref_frame] ==

+          cm->ref_frame_sign_bias[second_ref_frame])

+        continue;

+

       if (!(cpi->ref_frame_flags & flag_list[second_ref_frame])) continue;

       // Do not allow compound prediction if the segment level reference frame

       // feature is in use as in this case there can only be one reference.