perf: Some improvements for Skylake perf

[Andi Kleen]

This patchkit improves the Skylake core PMU perf port

- Fix problems with LBR freezing with a new APIC ack sequence
- Improve performance and accuracy of the NMI handler with counter freezing
- Improve sampling quality with cycles:pp

The last feature could be used on other CPUs too, but for now it's only
enabled on Skylake.

-Andi
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