[Bug c++/65690] [5 Regression] typedef alignment lost since r219705

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65690

--- Comment #4 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
This is better version of the patch that at least seems to survive early stages
of bootstrap ;)
Index: tree.c
===================================================================
--- tree.c      (revision 221909)
+++ tree.c      (working copy)
@@ -1053,26 +1053,16 @@ cp_build_qualified_type_real (tree type,
       if (element_type == error_mark_node)
        return error_mark_node;

-      /* See if we already have an identically qualified type.  Tests
-        should be equivalent to those in check_qualified_type.  */
+      /* See if we already have an identically qualified type.  */
       for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
        if (TREE_TYPE (t) == element_type
-           && TYPE_NAME (t) == TYPE_NAME (type)
-           && TYPE_CONTEXT (t) == TYPE_CONTEXT (type)
-           && attribute_list_equal (TYPE_ATTRIBUTES (t),
-                                    TYPE_ATTRIBUTES (type)))
+           && check_base_type (t, type))
          break;

       if (!t)
        {
-         t = build_cplus_array_type (element_type, TYPE_DOMAIN (type));
-
-         /* Keep the typedef name.  */
-         if (TYPE_NAME (t) != TYPE_NAME (type))
-           {
-             t = build_variant_type_copy (t);
-             TYPE_NAME (t) = TYPE_NAME (type);
-           }
+         t = build_variant_type_copy (type);
+         TREE_TYPE (t) = element_type;
        }

       /* Even if we already had this variant, we update