[issue11549] Build-out an AST optimizer, moving some functionality out of the peephole optimizer

[INADA Naoki]

INADA Naoki added the comment:

My motivation is improve speed, reduce memory usage, and quicker
startup time for real world applications.  If some optimization in
FAT optimizer has significant speedup, I want to try it.

But this time, my motivation is I felt "everyone think constant folding
should go to AST from peephole, there is a patch about it, but unfortunately
it was suspended (because of lack of reviewers, maybe)."

As reading #28813, I think there are consensus about constant folding
should go AST.

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<http://bugs.python.org/issue11549>
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