* exp_dbug.adb (Debug_Renaming_Declaration): Process underlying types.
	Emit GNAT encodings for object renamings involving record components
	whose normalized bit offset is not null.
	* uintp.h (UI_No_Uint): Declare.
	* gcc-interface/gigi.h (can_materialize_object_renaming_p): New.
	* gcc-interface/utils.c (can_materialize_object_renaming_p): New
	function.
	* gcc-interface/trans.c (gnat_to_gnu) <N_Object_Renaming_Declaration>:
	In code generation mode, materialize all renamings as long as they need
	debug info and we are not optimizing.

From-SVN: r240985