bpf: Support atomic CAS #78
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Implement lock-based fallback using swap/load/store when the
fallbackfeature is enabled because CAS is unavailable. This is not great, but if the upstream bug that causes errors when using CAS (rust-lang/rust#106795 (comment)) is fixed in the future, we can implement {8,16,32,64}-bit atomic using 64-bit CAS.Closes #29