Need help with compiler-rt/test/fuzzer/cross_over_uniform_dist.test

I'm seeing a failure in this test on one bot:

https://lab.llvm.org/buildbot/#/builders/37/builds/5945

after https://reviews.llvm.org/D107162 where I changed lit so that it
would allow substrings of the target triple in the REQUIRES clause.
My patch was only one of 5 new commits in that build, and really
none of them seem like they could have affected the test.

I've verified that the failing test runs fine in my environment,
with or without my patch, and with a more recent HEAD. If someone
can help reproduce the failure or otherwise identify what the problem
is, that would be REALLY helpful.

Thanks,
--paulr

I've reverted my patch, as it is the least unlikely candidate.
I'll pursue this further on Monday (but any assistance is still
gratefully accepted!).
Thanks,
--paulr