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

[Brett Cannon]

Brett Cannon added the comment:

Attached is what I plan to commit to Python 2.7 assuming everyone is happy with the outcome. I tweaked the echoed messages from Alecsandru's patch, pulled in the README changes, and dropped the x86 checks as Antoine and Stefan requested.

Assuming people are happy with the patch I will also apply it to Python 3.5 with the appropriate tweaks.

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Added file: http://bugs.python.org/file40441/issue24915-python2.7.diff

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