When materializing a cloned function with arguments removed,

to TYPE_POINTER_TO field of the new type (which has fewer
arguments) was left pointing to the original type.

From-SVN: r161918

gcc/ChangeLog

+2010-07-07  Duncan Sands  <baldrick@free.fr>
+
+	PR middle-end/41355
+	* tree.c (build_function_type_skip_args): Copy the original type using
+        build_distinct_type_copy rather than copy_node.
+
 2010-07-07  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR target/44850

gcc/tree.c

@@ -7350,7 +7350,7 @@ build_function_type_skip_args (tree orig_type, bitmap args_to_skip)
   if (TREE_CODE (orig_type) != METHOD_TYPE
       || !bitmap_bit_p (args_to_skip, 0))
     {
-      new_type = copy_node (orig_type);
+      new_type = build_distinct_type_copy (orig_type);
       TYPE_ARG_TYPES (new_type) = new_reversed;
     }
   else