reorg: Change return type of predicate functions from int to bool

Also change some internal variables and function arguments from int to bool.

gcc/ChangeLog:

	* reorg.cc (stop_search_p): Change return type from int to bool
	and adjust function body accordingly.
	(resource_conflicts_p): Ditto.
	(insn_references_resource_p): Change return type from int to bool.
	(insn_sets_resource_p): Ditto.
	(redirect_with_delay_slots_safe_p): Ditto.
	(condition_dominates_p): Change return type from int to bool
	and adjust function body accordingly.
	(redirect_with_delay_list_safe_p): Ditto.
	(check_annul_list_true_false): Ditto.  Change "annul_true_p"
	function argument to bool.
	(steal_delay_list_from_target): Change "pannul_p" function
	argument to bool pointer.  Change "must_annul" and "used_annul"
	variables from int to bool.
	(steal_delay_list_from_fallthrough): Ditto.
	(own_thread_p): Change return type from int to bool and adjust
	function body accordingly.  Change "allow_fallthrough" function
	argument to bool.
	(reorg_redirect_jump): Change return type from int to bool.
	(fill_simple_delay_slots): Change "non_jumps_p" function
	argument from int to bool.  Change "maybe_never" varible to bool.
	(fill_slots_from_thread): Change "likely", "thread_if_true" and
	"own_thread" function arguments to bool.  Change "lose" and
	"must_annul" variables to bool.
	(delete_from_delay_slot): Change "had_barrier" variable to bool.
	(try_merge_delay_insns): Change "annul_p" variable to bool.
	(fill_eager_delay_slots): Change "own_target" and "own_fallthrouhg"
	variables to bool.
	(rest_of_handle_delay_slots): Change return type from int to void
	and adjust function body accordingly.