Alex Lam S.L 8223b2e0db fix AST_Node.optimize() (#1602) ...

Liberal use of `Compressor.transform()` and `AST_Node.optimize()` presents an issue for look-up operations like `TreeWalker.in_boolean_context()` and `TreeWalker.parent()`.

This is an incremental fix such that `AST_Node.optimize()` would now contain the correct stack information when called correctly.

2017-03-15 18:44:13 +08:00

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