2012-01-06  Jakub Jelinek  <jakub@redhat.com>

	PR gcov-profile/50127
	* bb-reorder.c (partition_hot_cold_basic_blocks): Clear
	bb->aux before running df_analyze.

--- gcc/bb-reorder.c.jj	2011-11-10 18:09:12.000000000 +0100
+++ gcc/bb-reorder.c	2012-01-06 13:47:39.619401395 +0100
@@ -2219,6 +2219,7 @@ static unsigned
 partition_hot_cold_basic_blocks (void)
 {
   VEC(edge, heap) *crossing_edges;
+  basic_block bb;
 
   if (n_basic_blocks <= NUM_FIXED_BLOCKS + 1)
     return 0;
@@ -2254,6 +2255,10 @@ partition_hot_cold_basic_blocks (void)
 
   add_reg_crossing_jump_notes ();
 
+  /* Clear bb->aux fields that the above routines were using.  */
+  FOR_EACH_BB (bb)
+    bb->aux = NULL;
+
   VEC_free (edge, heap, crossing_edges);
 
   /* ??? FIXME: DF generates the bb info for a block immediately.