tree 4584518ec9d6d4709d43d7b4f04046efef4d16d6
parent 7da95ed0614ad5bda02624cb84c87da6f732eab7
author Marco Paniconi <marpan@google.com> 1583450948 -0800
committer Marco Paniconi <marpan@google.com> 1583517640 -0800

rtc: Reference skip based on pred_mv_sad for nonrd

Under the flag nonrd_prune_ref_frame_search, allow
for skipping reference frame based on pred_mv_sad
of non-LAST reference realtive to LAST.

As threshold use the pred_mv_sad from find_predictors
so can also remove an extra sad computation for
pred_mv_sad for NEWMV-LAST mode. Also remove the flag
use_golden_nonzeromv which is not being used.

Speedup on qvga clips: ~4-5% speed 7, ~2-3% on speed 8

Small bdrate loss for speed 7/8 on rtc_derf:
avg. ~0.2/0.1, max ~0.8/0.3.

Change-Id: Ifce99c225db38ae658b3bdfd7b3d2a830b373fbc