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set interp_filter to SWITCHABLE_FILTER for intra block

In vp9_pick_inter_mode(), instead of using
vp9_get_pred_context_switchable_interp(xd) to assign filter_ref,
we use a less strict condition on assigning filter_ref.
This is to reduce the probabily of entering the flow of not
assigning filter_ref and then skipping filter search.

Overall PSNR gain 0.074% for rtc dataset

Details:
Low    Mid     High
0.185% -0.008% -0.082%

Change-Id: Id5c5ab38d3766c213d5681e17b4d1afd1529e676

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

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

@@ -1299,11 +1299,8 @@

   MODE_INFO *const mi = xd->mi[0];

   INTERP_FILTER filter_ref;

-  if (xd->above_mi)

-    filter_ref = xd->above_mi->interp_filter;

-  else if (xd->left_mi)

-    filter_ref = xd->left_mi->interp_filter;

-  else

+  filter_ref = vp9_get_pred_context_switchable_interp(xd);

+  if (filter_ref == SWITCHABLE_FILTERS)

     filter_ref = EIGHTTAP;

   mi->sb_type = bsize;

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

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

@@ -1410,9 +1410,13 @@

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

   x->skip = 0;

-  if (xd->above_mi)

+  // Instead of using vp9_get_pred_context_switchable_interp(xd) to assign

+  // filter_ref, we use a less strict condition on assigning filter_ref.

+  // This is to reduce the probabily of entering the flow of not assigning

+  // filter_ref and then skip filter search.

+  if (xd->above_mi && is_inter_block(xd->above_mi))

     filter_ref = xd->above_mi->interp_filter;

-  else if (xd->left_mi)

+  else if (xd->left_mi && is_inter_block(xd->left_mi))

     filter_ref = xd->left_mi->interp_filter;

   else

     filter_ref = cm->interp_filter;

@@ -1976,6 +1980,10 @@

   mi->mode = best_mode;

   mi->ref_frame[0] = best_ref_frame;

   x->skip_txfm[0] = best_mode_skip_txfm;

+

+  if (!is_inter_block(mi)) {

+    mi->interp_filter = SWITCHABLE_FILTERS;

+  }

   if (reuse_inter_pred && best_pred != NULL) {

     if (best_pred->data != orig_dst.buf && is_inter_mode(mi->mode)) {