Set max_intra_bsize to 32x32

At --good and speed 3 or above for resolution less than 720p. This
disables the tests for 64x64 intra prediction modes. Encoding time
reduction is about 1%.

Change-Id: Ib396e3d1417fece416e3f0fee929b128acbb130f

vp9/encoder/vp9_speed_features.c

@@ -110,16 +110,16 @@ static void set_good_speed_feature(VP9_COMP *cpi, VP9_COMMON *cm,
   if (speed >= 3) {
     sf->tx_size_search_method = frame_is_intra_only(cm) ? USE_FULL_RD
                                                         : USE_LARGESTALL;
-    if (MIN(cm->width, cm->height) >= 720)
+    if (MIN(cm->width, cm->height) >= 720) {
       sf->disable_split_mask = DISABLE_ALL_SPLIT;
-    else
+    } else {
+      sf->max_intra_bsize = BLOCK_32X32;
       sf->disable_split_mask = DISABLE_ALL_INTER_SPLIT;
-
+    }
     sf->adaptive_pred_interp_filter = 0;
     sf->cb_partition_search = frame_is_boosted(cpi) ? 0 : 1;
     sf->cb_pred_filter_search = 1;
     sf->motion_field_mode_search = frame_is_boosted(cpi) ? 0 : 1;
-
     sf->lf_motion_threshold = LOW_MOTION_THRESHOLD;
     sf->last_partitioning_redo_frequency = 3;
     sf->recode_loop = ALLOW_RECODE_KFMAXBW;
@@ -181,6 +181,7 @@ static void set_rt_speed_feature(VP9_COMP *cpi, SPEED_FEATURES *sf,
       sf->disable_split_mask = DISABLE_COMPOUND_SPLIT;
 
     sf->use_rd_breakout = 1;
+
     sf->adaptive_motion_search = 1;
     sf->adaptive_pred_interp_filter = 1;
     sf->mv.auto_mv_step_size = 1;