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

[INADA Naoki]

INADA Naoki added the comment:

Before trying advanced optimizations, I want move suspended obvious optimizations forwards.

For example, removing unused constants is suspended because constant folding
should be moved from peephole to AST.  This is why I found this issue.

After that, I'm thinking about shrinking stacksize. frame_dealloc (scans whole stack) is one of hot functions.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11549>
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