re PR bootstrap/48804 (Bootstrap compare failure)

2011-04-28  Richard Guenther  <rguenther@suse.de>

	PR bootstrap/48804
	Revert
	2011-04-28  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-structalias.c (solve_constraints): Build succ graph
	as late as possible.

From-SVN: r173067

gcc/ChangeLog

 2011-04-28  Richard Guenther  <rguenther@suse.de>
 
+	PR bootstrap/48804
+	Revert
+	2011-04-28  Richard Guenther  <rguenther@suse.de>
+
+	* tree-ssa-structalias.c (solve_constraints): Build succ graph
+	as late as possible.
+ 
+2011-04-28  Richard Guenther  <rguenther@suse.de>
+
 	* tree-ssa-structalias.c (dump_constraint): Don't end the line.
 	(debug_constraint): Do it here.
 	(dump_constraints): And here.

gcc/tree-ssa-structalias.c

@@ -6359,10 +6359,11 @@ solve_constraints (void)
     fprintf (dump_file, "Rewriting constraints and unifying "
 	     "variables\n");
   rewrite_constraints (graph, si);
-  free_var_substitution_info (si);
 
   build_succ_graph ();
 
+  free_var_substitution_info (si);
+
   /* Attach complex constraints to graph nodes.  */
   move_complex_constraints (graph);