[issue17636] Modify IMPORT_FROM to fallback on sys.modules

[Dino Viehland]

Change by Dino Viehland <dinoviehland at gmail.com>:


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pull_requests: +17722
pull_request: https://github.com/python/cpython/pull/18347

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue17636>
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