FreeBSD/src 78f1851 (r354638)sys/amd64/amd64 db_trace.c, sys/i386/i386 db_trace.c

teach db_nextframe/x86 about [X]xen_intr_upcall interrupt handler

Discussed with: kib, royger
MFC after:      3 weeks
Sponsored by:   Panzura
DeltaFile
+2-1sys/i386/i386/db_trace.c
+1-0sys/amd64/amd64/db_trace.c
+3-12 files

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