decl.c (gnat_to_gnu_entity): For a constant object whose type has self-referential size...

	* decl.c (gnat_to_gnu_entity) <object>: For a constant object whose
	type has self-referential size, get the size from the initializing
	expression directly if it is also a constant whose nominal type
	has self-referential size.

From-SVN: r133831