bb-reorder.c (reorder_basic_blocks_simple): Clear BB_VISITED before using it.

2016-10-17  Richard Biener  <rguenther@suse.de>

	* bb-reorder.c (reorder_basic_blocks_simple): Clear BB_VISITED
	before using it.

From-SVN: r241237

gcc/ChangeLog

+2016-10-17  Richard Biener  <rguenther@suse.de>
+
+	* bb-reorder.c (reorder_basic_blocks_simple): Clear BB_VISITED
+	before using it.
+
 2016-10-17  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
 
 	PR tree-optimization/71636

gcc/bb-reorder.c

@@ -2355,7 +2355,10 @@ reorder_basic_blocks_simple (void)
      To start with, everything points to itself, nothing is assigned yet.  */
 
   FOR_ALL_BB_FN (bb, cfun)
-    bb->aux = bb;
+    {
+      bb->aux = bb;
+      bb->flags &= ~BB_VISITED;
+    }
 
   EXIT_BLOCK_PTR_FOR_FN (cfun)->aux = 0;