perf: Add missing PEBS frontend support to Skylake

[Andi Kleen]

Hi Peter,

I noticed that tip/perf/core is missing the Skylake PEBS Frontend
extrareg support. At some point you had signed off on it, but then Stephane
found another issue which was fixed with an follow-on patch.

It would be good if that could be merged this cycle too, as that
would make the Skylake core perf support complete. The new frontend 
profiling support is very useful to identify frontend bound issues.

I'm resending the two patches here.

-Andi

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