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

[Brett Cannon]

Brett Cannon added the comment:

Any specific reason the v3 patch, Alecsandru, is listed as against 3.5 in the filename? Or is that just a typo?

P.S.: I did another review asking about explicit Clang support and also supporting Greg's request to use `-m test` instead of the explicit file execution.

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