MFC r246248: cpususpend_handler: mark AP as resumed only after fully
setting up lapic
MFC r233579,236403,236408: make interrupt flags management closer to head

r233579: Restore interrupt state after executing AcpiEnterSleepState().
r236403,236408: acpi_wakeup_machdep/acpi_sleep_machdep

The merged changes are modified a bit to account for lots of missing
acpi and acpica MFCs.
For the same reason MFC to stable/8 is not practical.

MFC slackers:	iwasaki, jkim