A small fix.

[Matthew Dobson]

This patch gets stack backtracing to work, and also allows CPU switching on our 
NUMA-Q hardware.  Pat Gaughen and I had posted here a little while ago about 
the problems we were experiencing with KDB.  This patch fixes them for me, so 
if anyone else can verify that they work smoothly for you too, that'd be great!

Cheers!

-Matt
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