x86: export vector_used_by_percpu_irq

Impact: build fix

lguest can be built as a module and makes use of this new symbol:

ERROR: "vector_used_by_percpu_irq" [drivers/lguest/lg.ko] undefined!

export it.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
1 file changed