- Allow multiple INTR_FAST handlers for the same source. The motivation

  for this are the on-board SCCs and UARTs that use a shared IRQ. [1]
- Rework the interrupt counting code to account for shared interrupts. [1]
- In case ithread_add_handler() failed in inthand_add() just return with
  the error code instead of setting up a non-fast handler regardless or
  setting up a non-fast handler instead of a fast handler. I can't think
  of a situation where the former behaviour would do the right thing.

Reviewed by:	marcel [1]
Based on:	sys/i386/i386/intr_machdep.c [1]

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