[issue36478] backport of pickle fixes to Python 3.5.7 uses C99 for loops

[Anthony Sottile]

Change by Anthony Sottile <asottile at umich.edu>:


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keywords: +patch
pull_requests: +12556
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36478>
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