* exp_disp.adb (Make_Tags): Mark the imported view of dispatch tables
	built for interfaces.
	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Variable>: Use
	imported_p instead of Is_Imported when considering constants.
	Do not promote alignment of exported objects.
	<E_Record_Subtype>: Strip all suffixes for dispatch table entities.

From-SVN: r159247