[issue11549] Rewrite peephole to work on AST

[Eugene Toder]

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

AFAICT my patch has everything that #1346238 has, except BoolOps, which can be easily added (there's a TODO). I don't want to add any new code, though, until the current patch will get reviewed -- adding code will only make reviewing harder.

#10399 looks interesting, I will take a look.

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