A long, long, time ago, pending interrupt handlers were stored in arrays

of up to 8 handlers, one arrays par ipl level. Eventually the interrupt
logic was changed to linked lists, but the arrays remained, even when
the pending interrupt structures were moved to per-cpu data.

Simplify this by only keeping a pointer to the list head, per ipl level;
update the computations in locore accordingly, and update the relevant
comments to match reality as well.

ok kettenis@

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