[5.5] Further workaround for priority mishandling in runtime. #38428
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See rdar://79378762, SR-14802, SR-14841, SR-14875.
This doesn't resolve all hangs, such as those occurring
due to explicit usage of priorities and certain other
situations where priorities seem to be causing issues
(rdar://79823345), but it does resolve some cases.
(cherry picked from commit fa40675)