cp-tree.h (struct lang_type): Add anon_union field.

cp-tree.h (struct lang_type): Add anon_union field.

	* cp-tree.h (struct lang_type): Add anon_union field.
	(ANON_UNION_TYPE_P): Use it instead of examining type.
	(SET_ANON_UNION_TYPE_P): New macro.
	* decl.c (check_tag_decl): Use it.
	* search.c (compute_access): Handle non-type contexts earlier, and
	handle NULL_TREE.
	* tree.c (build_exception_variant): Use copy_to_permanent.

From-SVN: r25618