Removing is_intra_mode() function.

It is enough to check just block type: intra or inter. Intra block implies
intra prediction mode, and inter block implies inter mode.

Change-Id: I3cf98731a3935f670a3cd8e2b2443483eb944be4

vp9/common/vp9_blockd.h

diff --git a/vp9/common/vp9_blockd.h b/vp9/common/vp9_blockd.h
index bac40c5..ff047b8 100644
--- a/vp9/common/vp9_blockd.h
+++ b/vp9/common/vp9_blockd.h
@@ -74,10 +74,6 @@
   MB_MODE_COUNT
 } MB_PREDICTION_MODE;
 
-static INLINE int is_intra_mode(MB_PREDICTION_MODE mode) {
-  return mode <= TM_PRED;
-}
-
 static INLINE int is_inter_mode(MB_PREDICTION_MODE mode) {
   return mode >= NEARESTMV && mode <= NEWMV;
 }

vp9/encoder/vp9_rdopt.c

diff --git a/vp9/encoder/vp9_rdopt.c b/vp9/encoder/vp9_rdopt.c
index d25112b..e4be046 100644
--- a/vp9/encoder/vp9_rdopt.c
+++ b/vp9/encoder/vp9_rdopt.c
@@ -3526,16 +3526,14 @@
     }
 
     // Keep record of best intra rd
-    if (xd->mi_8x8[0]->mbmi.ref_frame[0] == INTRA_FRAME &&
-        is_intra_mode(xd->mi_8x8[0]->mbmi.mode) &&
+    if (!is_inter_block(&xd->mi_8x8[0]->mbmi) &&
         this_rd < best_intra_rd) {
       best_intra_rd = this_rd;
       best_intra_mode = xd->mi_8x8[0]->mbmi.mode;
     }
+
     // Keep record of best inter rd with single reference
-    if (xd->mi_8x8[0]->mbmi.ref_frame[0] > INTRA_FRAME &&
-        xd->mi_8x8[0]->mbmi.ref_frame[1] == NONE &&
-        !mode_excluded &&
+    if (is_inter_block(&xd->mi_8x8[0]->mbmi) && !mode_excluded &&
         this_rd < best_inter_rd) {
       best_inter_rd = this_rd;
       best_inter_ref_frame = ref_frame;