Replace deprecated compare_and_swap with compare_exchange #28
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compare_and_swapis deprecated in 1.50. (rust-lang/rust#79261)This patch replaces the uses of
compare_and_swapwithcompare_exchange.See also the document about
compare_and_swap->compare_exchange(_weak)migration: https://doc.rust-lang.org/nightly/core/sync/atomic/struct.AtomicUsize.html#migrating-to-compare_exchange-and-compare_exchange_weak