linux-wandboard

xen: pack all irq-related info together

Put all irq info into one struct.  Also, use a union to keep
event channel type-specific information, rather than overloading the
index field.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>