[issue44800] Code readability: rename InterpreterFrame to `_Py_framedata`

[Nick Coghlan]

Change by Nick Coghlan <ncoghlan at gmail.com>:


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pull_requests: +26326
pull_request: https://github.com/python/cpython/pull/3640

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44800>
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