Martin Storsjö d5d477780c [libcxx] [test] Fix spurious failures in the thread join test on Windows
Make sure that the detached thread has started up before exiting
the process.

This is exactly the same fix as D105592, with the same pattern
being present in a different test case.

Differential Revision: https://reviews.llvm.org/D105736
2021-07-12 23:31:53 +03:00
..