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[Diego Novillo]

This patch adds directory lib/ProfileData/PerfConverter. The top
level contains a mix of generic support for reading ELF binaries,
Perf data and generating the Sample PGO profile read by
lib/Transforms/Scalar/SampleProfile.cpp.

I plan to separate parts of this directory into lib/ProfileData
to provide generic support for plugging other sample profilers.
But initially, I would prefer if I can keep the initial commit
close to the original github sources.


Diego.
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