re PR lto/54811 (tree code '�' is not supported in LTO streams)

2012-10-05  Richard Guenther  <rguenther@suse.de>

	PR middle-end/54811
	* tree-ssa-live.c (clear_unused_block_pointer_1): Look at
	DECL_DEBUG_EXPR again.

From-SVN: r192120

gcc/ChangeLog

+2012-10-05  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/54811
+	* tree-ssa-live.c (clear_unused_block_pointer_1): Look at
+	DECL_DEBUG_EXPR again.
+
 2012-10-05  Jan Hubicka  <jh@suse.cz>
 	    Jakub Jelinek  <jakub@redhat.com>
 

gcc/tree-ssa-live.c

@@ -621,6 +621,11 @@ clear_unused_block_pointer_1 (tree *tp, int *, void *)
   if (EXPR_P (*tp) && TREE_BLOCK (*tp)
       && !TREE_USED (TREE_BLOCK (*tp)))
     TREE_SET_BLOCK (*tp, NULL);
+  if (TREE_CODE (*tp) == VAR_DECL && DECL_DEBUG_EXPR_IS_FROM (*tp))
+    {
+      tree debug_expr = DECL_DEBUG_EXPR (*tp);
+      walk_tree (&debug_expr, clear_unused_block_pointer_1, NULL, NULL);
+    }
   return NULL_TREE;
 }