they contain. IRQ information for these has been removed from the
kernel configuration file. GSC bus chips now choose an available CPU
IRQ for themselves, and know IRQ information for all of the devices
they may contain. Minor autoconfiguration changes support this.
Renamed the old-style vmstat interrupt counters to say "ipl" and not
"irq", since they've been disconnected from irq numbers. Also provide
a function to allocate an irq bit from an interrupt register, and a
function to report the next ipl bit that will be allocated.
