[issue33695] Have shutil.copytree(), copy() and copystat() use cached scandir() stat()s

[Giampaolo Rodola']

Change by Giampaolo Rodola' <g.rodola at gmail.com>:


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nosy: +benhoyt, benjamin.peterson, brett.cannon, ncoghlan, serhiy.storchaka, stutzbach, tarek, vstinner, yselivanov

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33695>
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