replace deprecated compare_and_swap() with compare_exchange() #1080
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AtomicU32::compare_and_swap() is marked deprecated, in favor of compare_exchange().
compare_exchange() is fallible, so we continue to loop if it fails.
According to the docs, for the original AcqRel ordering, the equivalent failure ordering is Acquire.
https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html#method.compare_exchange_weak