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bpo-40275: Fix test.support.threading_helper (GH-20488)

* Add missing sys import
* Get verbose and gc_collect() from test.support
* Remove unused starttime variable.

Issues spotted by pyflakes.
V
Victor Stinner committed
753643205a28531fd43ef36b40b86282ae6956a7
Parent: 24bddc1
Committed by GitHub <noreply@github.com> on 5/28/2020, 2:37:37 PM