perf offcore patchkit for merge

[Andi Kleen]

This is the latest version of the perf offcore / extra regs
patchkit. I addressed all earlier comments I believe and
this should be ready for merge now.

- Allocating multiple registers is supported now
- I kept the percore allocation because the manual
kmalloc method turned out to be more complicated and 
alloc_percpu() really already did what I wanted.
However I switched to using the CPU notifier to set up the 
topology for hotplug, together with a bugfix to make sure 
x86 sets up the topology before calling it.
- A few other improvements.

-Andi
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