Updated and combined Sandy Bridge/Ivy Bridge perf patchkits

I combined the SandyBridge and Ivy Bridge patchkit into one series,
because they always conflicted.

All review comments addressed I believe.

- Microcode load patches now rely on the patches to update microcode
on all CPUs.
- Updated version of the SandyBridge PEBS version check, to reenable
PEBS for systems with appropiate microcode
- Remove unsupported events on IvyBridge
- Add Precise Instruction Distribution for IvyBridge, to allow profiling
with less surprises and avoid some systematic errors
- Minor fixes

Please apply.

-Andi

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