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Remove ARF mode entries from THR_MODES array in non-RD mode

The alternate reference frame is disabled in non-RD mode. No need
to keep the related entries in the THR_MODES array.

Change-Id: I53386f4bb1c6284f582801f27246c5edf55bc24b

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

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

@@ -447,11 +447,10 @@

   args->dist += dist;

 }

-static const THR_MODES mode_idx[MAX_REF_FRAMES][4] = {

+static const THR_MODES mode_idx[MAX_REF_FRAMES - 1][4] = {

   {THR_DC, THR_H_PRED, THR_V_PRED, THR_TM},

   {THR_NEARESTMV, THR_NEARMV, THR_ZEROMV, THR_NEWMV},

   {THR_NEARESTG, THR_NEARG, THR_ZEROG, THR_NEWG},

-  {THR_NEARESTA, THR_NEARA, THR_ZEROA, THR_NEWA},

 };

 static const PREDICTION_MODE intra_mode_list[] = {