re PR debug/46931 (Subversion id 167184 breaks building perlbench on power7 with debug)

PR debug/46931
* tree-vect-loop-manip.c (slpeel_tree_peel_loop_to_edge): Update
SSA before removing dead stmts.

From-SVN: r168299

gcc/ChangeLog

+2010-12-28  Richard Guenther  <rguenther@suse.de>
+
+	PR debug/46931
+	* tree-vect-loop-manip.c (slpeel_tree_peel_loop_to_edge): Update
+	SSA before removing dead stmts.
+
 2010-12-28  H.J. Lu  <hongjiu.lu@intel.com>
 	    Uros Bizjak  <ubizjak@gmail.com>
 

gcc/tree-vect-loop-manip.c

@@ -1442,6 +1442,9 @@ slpeel_tree_peel_loop_to_edge (struct loop *loop,
   if (update_first_loop_count)
     slpeel_make_loop_iterate_ntimes (first_loop, first_niters);
 
+  BITMAP_FREE (definitions);
+  delete_update_ssa ();
+
   /* Remove all pattern statements from the loop copy.  They will confuse
      the expander if DCE is disabled.
      ???  The pattern recognizer should be split into an analysis and
@@ -1451,9 +1454,6 @@ slpeel_tree_peel_loop_to_edge (struct loop *loop,
 
   adjust_vec_debug_stmts ();
 
-  BITMAP_FREE (definitions);
-  delete_update_ssa ();
-
   return new_loop;
 }