Work around a race condition where an interrupt handler can be removed from

an interrupt thread while the interrupt thread is blocked on Giant waiting
to execute the interrupt handler being removed.  The result was that the
intrhand structure would be free'd, and we would call 0xdeadc0de.  The work
around is to check to see if the interrupt thread is idle when removing a
handler.  If not, then we mark the interrupt handler as being dead using
the new IH_DEAD flag and don't remove it from the interrupt threads' list
of handlers.  When the interrupt thread resumes, it will see a dead handler
while traversing the list of handlers and will remove the handler then.

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