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Unify intra mode mask into mode_skip_mask scheme

Integrate intra mode mask speed feature with the mode_skip_mask
scheme. Move it outside the mode search loop in the
vp9_rd_pick_inter_mode_sb function.

Change-Id: I7738fea749bfdc08ad05d7f2524feb8ff67568d9

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -2592,8 +2592,6 @@

   const int *const rd_threshes = rd_opt->threshes[segment_id][bsize];

   const int *const rd_thresh_freq_fact = rd_opt->thresh_freq_fact[bsize];

   const int mode_search_skip_flags = cpi->sf.mode_search_skip_flags;

-  const int intra_y_mode_mask =

-      cpi->sf.intra_y_mode_mask[max_txsize_lookup[bsize]];

   vp9_zero(best_mbmode);

   x->skip_encode = cpi->sf.skip_encode_frame && x->q_index < QIDX_SKIP_THRESH;

@@ -2686,6 +2684,9 @@

     ref_frame_skip_mask[1] |= (1 << INTRA_FRAME);

   }

+  mode_skip_mask[INTRA_FRAME] |=

+      ~(cpi->sf.intra_y_mode_mask[max_txsize_lookup[bsize]]);

+

   for (mode_index = 0; mode_index < MAX_MODES; ++mode_index) {

     int mode_excluded = 0;

     int64_t this_rd = INT64_MAX;

@@ -2813,8 +2814,6 @@

         if ((x->source_variance << num_pels_log2_lookup[bsize]) > best_pred_sse)

           continue;

-      if (!(intra_y_mode_mask & (1 << this_mode)))

-        continue;

       if (this_mode != DC_PRED) {

         // Disable intra modes other than DC_PRED for blocks with low variance

         // Threshold for intra skipping based on source variance