Memory ordered atomics #2602
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Memory ordered atomics #2602
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Add support for memory ordered atomics. Closes #2123
Sets the old behaviour of relaxed atomics as the default.
Also makes atomic ref ordering relaxed by default. Closes #2172
We emulate ordered atomics using fences when ordered atomics available natively.
We fall back to stronger guarantees if a backend does not support the requested order.
For CUDA in particular we do this according to this resource.