[rtsan] Add test for pthread_cond_wait segfault #39
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Introduce the test from llvm#146120
For future readers of this PR, if this test causes a segfault please comment out the line indicated by the comment (or revert this entire commit).
My plan is to commit this, see if any test runners fail, then submit the fix in a follow on.
I cannot repro this bug on my machine so I need some confirmation of the bug being fixed as it is submitted.