ioemu: Save PCI device INTx line states.

ioemu: Save PCI device INTx line states.

Otherwise, ioemu can be out of sync with the hypervisor after
restoring guest state, if INTx lines were asserted when the state was
saved. This prevents ioemu from setting the line to zero in Xen
(because it thinks the line is already zero). This can allow th eguest
to enter an endless IRQ loop and hang.

Signed-off-by: Kazuhiro Suzuki <kaz@jp.fujitsu.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>