perf: Add basic Skylake PMU support

[Andi Kleen]

This patchkit adds support for the Intel Skylake core PMU to perf, documented in the
recently released SDM 054[1] Vol3, 17.9 and 18.12. 

The main user visible feature is timed branch records, which allows to get cycle counts
for individual basic blocks, and a time stamp for PEBS records which improves
multi-record PEBS. The LBRs (branch records) also have been extended to 32, which allows
more accurate branch sampling and deeper call stacks.

-Andi

[1] http://www.cps.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html
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