[issue11549] Rewrite peephole to work on AST

[Eugene Toder]

Eugene Toder <eltoder at gmail.com> added the comment:

Also, to avoid any confusion -- currently my patch only runs AST optimizations before code generation, so compile() with ast.PyCF_ONLY_AST returns non-optimized AST.

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