[GSan] Fix GSAN atomic lowerings#10944
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Atomics get cluster barriers, and also broadcast their result across CTAs in multi-CTA kernels. When those atomic ops are converted to GSAN instrumented ops, the corresponding GSAN ops aren't lowered the same way. Introduce an
AtomicOpInterfaceand unify the atomic lowering logic.Without this, multi-CTA kernels with atomics miscompile under GSAN.
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