[WebAssembly] Support acquire-release atomics in CodeGen (#184900) Set the correct memory ordering for relaxed atomics after ISel. This allows SelectionDAG to keep the simple generic selection for target-independent AtomicLoad nodes, but keeps the ordering immediate correct in the MIR. Notably, the MachineMemOperand still has the original memory ordering and MIR passes would use that rather than the ordering immedate to make their code motion decisions (if we had any for Wasm, which we don't).
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