* 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.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@159247 138bc75d-0d04-0410-961f-82ee72b054a4