There are multiple data races reported when running the
InterpreterPoolMixin tests, but it's still useful to run the other
test_concurrent_futures tests under TSAN.
Add test_concurrent_futures to the TSAN test suite.
This is an implementation of InterpreterPoolExecutor that builds on ThreadPoolExecutor.
(Note that this is not tied to PEP 734, which is strictly about adding a new stdlib module.)
Possible future improvements:
* support passing a script for the initializer or to submit()
* support passing (most) arbitrary functions without pickling
* support passing closures
* optionally exec functions against __main__ instead of the their original module
Sam Gross