[rfc] [rft] change intr_event_bind() / ie_assign_cpu cpuid to int

[Adrian Chadd]

Hi!

This patch changes the ie_assign_cpu bit in the interrupt struct to
use an int instead of a u_char for a CPUID.

https://people.freebsd.org/~adrian/smp/20140915-intr-bind-cpuid-1.diff

I'd like some initial feedback on this. Yes, it's not cpuid_t
(although this all may end up becoming a uint32_t at some point soon)
but it does touch a few pieces of hardware I actually don't have and
don't know if I can emulate correctly.

Thanks!




-a