unconditionally compile most of the delay slot code

gcc/ChangeLog:

2015-10-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* cfgrtl.c (pass_free_cfg::execute): Adjust.
	* final.c (dbr_sequence_length): Always define.
	(shorten_branches): Adjust.
	* genattr-common.c (main): Always define DELAY_SLOTS.
	* genattr.c (main): Unconditionally declare functions and define
	macros related to delay slots.
	* genattrtab.c (write_eligible_delay): Adjust.
	(main): Always write out delay slot functions.
	* opts.c (default_options_table): Adjust.
	* reorg.c (redirect_with_delay_slots_safe_p): Likewise.
	(redirect_with_delay_list_safe_p): Likewise.
	(fill_simple_delay_slots): Likewise.
	(fill_slots_from_thread): Likewise.
	(make_return_insns): Likewise.
	(dbr_schedule): Likewise.
	(rest_of_handle_delay_slots): Likewise.
	(pass_delay_slots::gate): Likewise.
	* toplev.c (process_options): Likewise.

From-SVN: r229145