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vp9: Nonrd-pickmode: move some early exits up.

Move the early exit checks on usable_ref_frame and
skip_ref_find_pref up before the check on flag_svc_subpel.
The code under flag_svc_subpel requires frame_mv to be set
for the golden/spatial reference, which is only set if the
both those exits don't pass.

No change in behavior.

Change-Id: Id304276c745eeb389ff85fa2dcf510d5976bc413

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

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

@@ -1696,6 +1696,9 @@

       comp_pred = 1;

     }

+    if (ref_frame > usable_ref_frame) continue;

+    if (skip_ref_find_pred[ref_frame]) continue;

+

     if (flag_svc_subpel && ref_frame == GOLDEN_FRAME) {

       force_gf_mv = 1;

       // Only test mode if NEARESTMV/NEARMV is (svc_mv_col, svc_mv_row),

@@ -1718,9 +1721,6 @@

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

       if (segfeature_active(seg, mi->segment_id, SEG_LVL_REF_FRAME)) continue;

     }

-

-    if (ref_frame > usable_ref_frame) continue;

-    if (skip_ref_find_pred[ref_frame]) continue;

     // For SVC, skip the golden (spatial) reference search if sse of zeromv_last

     // is below threshold.