- Add counts to the ATPIC interrupt sources and point the ATPIC interrupt   source count pointers at them so that intr_execute_handlers() won't   choke when it tries to handle an unregisterd ATPIC interrupt source. - Install the low-level ATPIC interrupt handlers when we first program the   ATPIC in atpic_startup() rather than at SI_SUB_INTR.  This is only   necessary to work around buggy code that enables interrupts too early   in the boot process (namely, the vm86 code).
- Add counts to the ATPIC interrupt sources and point the ATPIC interrupt
  source count pointers at them so that intr_execute_handlers() won't
  choke when it tries to handle an unregisterd ATPIC interrupt source.
- Install the low-level ATPIC interrupt handlers when we first program the
  ATPIC in atpic_startup() rather than at SI_SUB_INTR.  This is only
  necessary to work around buggy code that enables interrupts too early
  in the boot process (namely, the vm86 code).

Approved by:	re (rwatson)

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase