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Turn on adaptive pred filter scheme for sub8x8 below 720p

For sequences of resolution below 720p, the encoder will check
intra prediction modes and inter prediction modes from LAST_FRAME.
This commit turns on adaptive prediction filter scheme for sub8x8
blocks, where inter prediction modes are enabled. For the test
sequence bus at CIF, the speed 2 runtime goes down from 17879 ms
to 16783 ms, i.e., 6% speed up. The compression performance of
derf set is down by -0.128%.

Change-Id: I01d5321a5ceab4e0666ac5be56c52d896c7a8d45

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -88,6 +88,7 @@

       sf->last_partitioning_redo_frequency = 3;

       sf->disable_split_mask = cm->show_frame ? DISABLE_ALL_SPLIT

                                               : DISABLE_ALL_INTER_SPLIT;

+      sf->adaptive_pred_interp_filter = 0;

     } else {

       sf->disable_split_mask = LAST_AND_INTRA_SPLIT_ONLY;

       sf->last_partitioning_redo_frequency = 2;

@@ -94,7 +95,6 @@

       sf->lf_motion_threshold = NO_MOTION_THRESHOLD;

     }

-    sf->adaptive_pred_interp_filter = 0;

     sf->reference_masking = 1;

     sf->mode_search_skip_flags = FLAG_SKIP_INTRA_DIRMISMATCH |

                                  FLAG_SKIP_INTRA_BESTINTER |

@@ -114,6 +114,8 @@

       sf->disable_split_mask = DISABLE_ALL_SPLIT;

     else

       sf->disable_split_mask = DISABLE_ALL_INTER_SPLIT;

+

+    sf->adaptive_pred_interp_filter = 0;

     sf->lf_motion_threshold = LOW_MOTION_THRESHOLD;

     sf->last_partitioning_redo_frequency = 3;

-- 

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