llvm dev - Mar 2019 - How to access result of LowerAtomic pass from backend?

Hi everyone,

In the wasm backend I need to figure out whether or not the LowerAtomic
pass lowered any atomic operations. Ultimately I would like to produce
different output at the MC layer depending on whether or not any
source-level atomics were lowered to non-atomic operations. Is it possible
to query the result of the LowerAtomic pass from the backend? If not, what
would be a better way to get this information? I would like to avoid having
to reimplement atomic lowering in the backend just to have access to this
information, if possible.

Thanks,

Thomas
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