[clang] [llvm] [WebAssembly] Support acquire-release atomics in CodeGen (PR #184900)

[Derek Schuff via cfe-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
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dschuff wrote:

I'll group and reorder, and add `unordered`. And maybe it just makes sense to merge these with atomic-mem-consistency.ll. That would mean 4 RUN lines in the same file, but there wouldn't be redundancy.

https://github.com/llvm/llvm-project/pull/184900