hw/core: Add interface to allocate and free a single IRQ
qemu_allocate_irq returns a single qemu_irq. The interface allows to specify an interrupt number. qemu_free_irq frees it. Signed-off-by: NMarcel Apfelbaum <marcel.a@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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