xen: add a handler for the debug interrupt

Handle the VIRQ_DEBUG signal and print a stack trace of each vCPU on the Xen
console. This is only used for debug purposes and is triggered by the
administ

xen: add a handler for the debug interrupt

Handle the VIRQ_DEBUG signal and print a stack trace of each vCPU on the Xen
console. This is only used for debug purposes and is triggered by the
administrator of the Xen host.

Sponsored by: Citrix Systems R&D
MFC after: 1 week

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