[3.8] bpo-25872: Fix KeyError using linecache from multiple threads (GH-20079)#20079

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miss-islington wants to merge 1 commit intopython:3.8from miss-islington:backport-d72ea60-3.8

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Commits on May 13, 2020

issue-25872: Fix KeyError using linecache from multiple threads (pythonGH-18007 )

mgraczyk
authored and
miss-islington
committed