dwarf2out.c (add_var_loc_to_decl): Add LABEL argument.

	* dwarf2out.c (add_var_loc_to_decl): Add LABEL argument.  Drop
	last chain entry if it starts with the still current label.
	(add_location_or_const_value_attribute): Check that
	loc_list->first->next is NULL instead of comparing ->first with
	->last.
	(dwarf2out_var_location): Pass last_label resp. last_postcall_label
	to add_var_loc_to_decl.

From-SVN: r158590