Add rayon to TSAN suppressions file
# on atomic::fence for correctness, which doesn't get picked up by TSAN
# as of Feb 1 2018 / rust 1.23.
race:crossbeam_epoch::internal::Global::collect
+
+# Rayon relies on crossbeam stuff which uses raw fences, which are
+# not detected by TSAN.
+race:rayon
