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Edit : I misread this article. Neiter of the projects i mentioned target webassembly. But CoreRT could one day.

Microsoft has two similar projects:

CoreRT : Which is a managed re-implementation of the CLR allowing for AoT compilation.

LLILC : A LLVM Backend for .NET MSIL. (Stalled)

CoreRT's WASM support is being worked on:

There are some instructions here:

Very cool! It seems I was more correct than I thought.

You can also contribute and track the progress here: https://github.com/dotnet/corert/issues/4659