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

[Brett Cannon]

Brett Cannon added the comment:

The problem with the output is that error cases are unimportant and yet it fooled Skip into temporarily caring until he finally noticed the warning message. So my worry is that someone doesn't notice the "NOTE: ignore errors as they don't affect anything" and then glances at the output to notice an error and then worries that their PGO run failed.

It people really want to add output back in, though, they will need to patch both the Makefile to have a big NOTE in it as well as the README to say that any errors during the test suite run are unimportant and do not affect the outcome of the profile-guided optimizations.

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