Fix migration failure with in-kernel IOAPIC emulation
Save and restore the ioapic base address and irr as part of the ioapic state.
This was tested by doing all the combinations of new and old QEMU versions;
the results were the same as last time:
old -> old: Bug
old -> new: Sane values, but not transferred over the wire
new -> old: Graceful fail, version mismatch
new -> new: Fixed values, taken from the wire
Signed-off-by: Chris Lalancette <clalance@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>