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

[Alecsandru Patrascu]

Alecsandru Patrascu added the comment:

I fixed the files after the review. Regarding the PROFILE_OPT_OLD line, I think that it is better to keep also the old task used for PGO, until clear evidence and measurements that regrtest is performing better on other architectures exists.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24915>
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