provide a way to get the number used for irq line, not only a string

representation, this is needed for devices like cbb which pass
the interrupt line down to the cardbus attachment and not
getting the right line before pci_intr_map() has done it's
dirty deed.
tested on i386 by jason@, compiles on alpha by art@.
ppc and mveppc are to be test-compiled, but should work (;

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