[issue24915] Profile Guided Optimization improvements (better training, llvm support, etc)

[Alecsandru Patrascu]

Changes by Alecsandru Patrascu <alecsandru.patrascu at intel.com>:


Added file: http://bugs.python.org/file40389/README2.7-pgo-v02.patch

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<http://bugs.python.org/issue24915>
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