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vp10: don't make right edge available across tile boundaries.

Change-Id: Ia81cf3858ef6c8d1fd4b1fb2dd9627906081129d

--- a/vp10/common/reconintra.c

+++ b/vp10/common/reconintra.c

@@ -708,8 +708,10 @@

   const int mi_col = -xd->mb_to_left_edge >> 6;

   const BLOCK_SIZE bsize = xd->mi[0]->mbmi.sb_type;

   const struct macroblockd_plane *const pd = &xd->plane[plane];

+  const int right_available =

+      mi_col + (bw >> !pd->subsampling_x) < xd->tile.mi_col_end;

   const int have_right = vp10_has_right(bsize, mi_row, mi_col,

-                                        xd->mb_to_right_edge > 0,

+                                        right_available,

                                         tx_size, loff, aoff,

                                         pd->subsampling_x);

   const int have_bottom = vp10_has_bottom(bsize, mi_row, mi_col,