Remove unnecessary del local variables at end of Gcf.destroy. #27498
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del manager, num
made sense prior to 9f3861f when we used to then call gc.collect(1) (so we needed to delete the variables from the local frame so that they can be gc'ed if needed), but we have since then removed the explicit gc call; thus the del statement doesn't really do anything anymore (the local frame is about to be destroyed and thus all local variables will be decref'ed anyways).PR summary
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