[issue11549] Rewrite peephole to work on AST

[Eugene Toder]

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

I've updated patches on Rietveld with some small changes. This includes better code generation for boolops used outside of conditions and cleaned up optimize_jumps(). This is probably the last change before I get some feedback.
Also, I forgot to mention yesterday, patches on Rietveld are vs. ab45c4d0b6ef

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