- Move struct ithd to sys/interrupt.h.

- Add a set of MI helper functions for interrupt threads:
  - ithread_create() creates a new interrupt thread
  - ithread_destroy() destroys an interrupt thread
  - ithread_add_handler() attaches a new handler to an interrupt thread
  - ithread_remove_handler() detaches a handler from an interrupt thread
- Rename sinthand_add() and sched_swi() to swi_add() and swi_sched()
  respectively so that they live in a consistent namespace.
- struct intrhand is no longer a public type.  It would be private to
  kern_intr.c but the current implementation of fast interrupts on the
  alpha requires the type to be exported.  However, all handlers should
  be treated as void * cookies in the way that new-bus treats them.  This
  includes references to software interrupt handlers.

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