[issue37032] Add CodeType.replace() method

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

See bpo-36886 "Failed to construct CodeType on Python-3.8.0a4" for other failures caused by the addition of the "posonlyargcount" parameter to code constructor.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37032>
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