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vp9-svc: Avoid minmax variance for non-reference frames.

For choose_partitioning (speed >= 6): avoid computation
of minmax variance for non-reference frames in SVC.

Existing condition only avoided this for speed >= 8.
Combine that existing logic with non-reference condition.

Small speedup (~0.5-1%) for 3 layer SVC,
neutral change on avgPSNR/SSIM metrics.

Change-Id: I3e9f3a1af0647b15e475cf170d9402908d672ee5

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -1202,6 +1202,7 @@

   const uint8_t *d;

   int sp;

   int dp;

+  int compute_minmax_variance = 1;

   unsigned int y_sad = UINT_MAX;

   BLOCK_SIZE bsize = BLOCK_64X64;

   // Ref frame used in partitioning.

@@ -1226,6 +1227,9 @@

   set_offsets(cpi, tile, x, mi_row, mi_col, BLOCK_64X64);

   segment_id = xd->mi[0]->segment_id;

+  if (cpi->oxcf.speed >= 8 || (cpi->use_svc && cpi->svc.non_reference_frame))

+    compute_minmax_variance = 0;

+

   if (cpi->sf.use_source_sad && !is_key_frame) {

     int sb_offset2 = ((cm->mi_cols + 7) >> 3) * (mi_row >> 3) + (mi_col >> 3);

     content_state = x->content_state_sb;

@@ -1448,7 +1452,7 @@

           force_split[split_index] = 1;

           force_split[i + 1] = 1;

           force_split[0] = 1;

-        } else if (cpi->oxcf.speed < 8 &&

+        } else if (compute_minmax_variance &&

                    vt.split[i].split[j].part_variances.none.variance >

                        thresholds[1] &&

                    !cyclic_refresh_segment_id_boosted(segment_id)) {