[3.7] bpo-34572: change _pickle unpickling to use import rather than retrieving from sys.modules (GH-9047)#11921
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Fix C implementation of pickle.loads to use importlib's locking mechanisms, and thereby avoid using partially-loaded modules.
(cherry picked from commit 4371c0a)
Co-authored-by: tjb900 ozburgess@gmail.com
https://bugs.python.org/issue34572