* writecode.c (lookup_inst): Generate inverse table on-the-fly.

* writecode.c (lookup_inst): Generate inverse table on-the-fly.
(z8k_inv_list): Delete global.
(DIRTY_HACK): Delete macro.
(makelist): Delete global.
(main): Delete code making a list.  Delete dirty hack code.  Use
lookup_inst instead of z8k_inv_list.
* list.c: Delete file.
* Makefile.in (writecode): Do not link in list.o.
(list.o): Delete target.