* gcc-interface/decl.c (is_from_limited_with_of_main): New predicate.
	(gnat_to_gnu_entity) <E_Subprogram_Type>: Invoke it on return and
	parameter types to detect circularities in ASIS mode.
	* gcc-interface/trans.c (Attribute_to_gnu): Mention AI05-0151.

From-SVN: r221447