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SubjectBasic perf PMU support for Haswell v2
This is based on v7 of the full Haswell PMU support, but 
ported to the latest perf/core and stripped down to the "basic support"
as requested. I consider all of this basic support for Haswell usage.
although it's a bit more than what you need if you never use -e cpu//
or -b options. I decided to include LBRs in the basic support.

Contains support for:
- Basic Haswell PMU and PEBS support
- Late unmasking of the PMI
- Support for wide counters
- New TSX counter flags, exported as sysfs attributes
- Support for checkpointed counters.
- New LBR flags, exported as new flags with tools support

Available from
git:// hsw/pmu5-basics

For more details on the Haswell PMU please see the SDM (Vol 3A, Chapter 19.2)
For more details on TSX please see
or next week's LWN.

v2: Addressed Stephane's feedback. See individual patches for details.


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