Fix supertx with ext-tile.

Change-Id: Ic2135c3812be009085c7c8e8dc15ee2ba618a67e

vp10/decoder/decodeframe.c

diff --git a/vp10/decoder/decodeframe.c b/vp10/decoder/decodeframe.c
index 73856d0..3364e7a 100644
--- a/vp10/decoder/decodeframe.c
+++ b/vp10/decoder/decodeframe.c
@@ -1026,7 +1026,11 @@
   set_mi_row_col(xd, tile, mi_row_pred, bh, mi_col_pred, bw,
                  cm->mi_rows, cm->mi_cols);
 
+#if CONFIG_EXT_TILE
+  xd->up_available    = (mi_row_ori > tile->mi_row_start);
+#else
   xd->up_available    = (mi_row_ori != 0);
+#endif  // CONFIG_EXT_TILE
   xd->left_available  = (mi_col_ori > tile->mi_col_start);
 
   set_plane_n4(xd, bw, bh, bwl, bhl);

vp10/encoder/encodeframe.c

diff --git a/vp10/encoder/encodeframe.c b/vp10/encoder/encodeframe.c
index 69dfd06..d031673 100644
--- a/vp10/encoder/encodeframe.c
+++ b/vp10/encoder/encodeframe.c
@@ -373,7 +373,11 @@
   assert(!(mi_col_pred & (mi_width - 1)) && !(mi_row_pred & (mi_height - 1)));
   set_mi_row_col(xd, tile, mi_row_pred, mi_height, mi_col_pred, mi_width,
                  cm->mi_rows, cm->mi_cols);
+#if CONFIG_EXT_TILE
+  xd->up_available    = (mi_row_ori > tile->mi_row_start);
+#else
   xd->up_available    = (mi_row_ori != 0);
+#endif  // CONFIG_EXT_TILE
   xd->left_available  = (mi_col_ori > tile->mi_col_start);
 
   // R/D setup.