[issue6042] Document and slightly simplify lnotab tracing

[Jeffrey Yasskin]

Jeffrey Yasskin <jyasskin at gmail.com> added the comment:

I've fixed #1689458. Here's a new version of the patch with the
simplifying tweaks to PyCode_CheckLineNumber() so y'all can see what
that looks like.

If I don't get any substantive comments by the weekend (thanks Antoine
for the docs +1 :), I'll assume I've looked at this code longer than
anyone in the last 7 years and commit it. :)

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Added file: http://bugs.python.org/file14038/lnotab.patch

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