[issue4477] Speed up PyEval_EvalFrameEx when tracing is off.

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

Before it is accepted, I'd like to see some independent analysis (which
I might have to carry out myself). It would also be good if some deeper
understanding of the effect could be provided - I'm fairly skeptical
that such a minor change should have any notable effect.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4477>
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