* hashtab.h (struct htab): Add del_f.

	(htab_del): New type.
	(htab_create): Add fourth argument.

	* hashtab.c (htab_create): Set del_f.
	(htab_delete, htab_empty, htab_remove_elt, htab_clear_slot):
	Use it.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@32459 138bc75d-0d04-0410-961f-82ee72b054a4