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Unity's burst compiler https://docs.unity3d.com/Packages/com.unity.burst@1.2/manual... uses LLVM, but only supports a somewhat limited subset of C#. I've used it a bit in some performance critical parts of a game and saw some dramatic speed increases. But I can't speak to other parts of the C# ecosystem beyond Unity though.

Anyone can build a frontend. "Java bytecode" is in that list too. It doesn't mean defacto compilers of these languages rely on LLVM.

In this case it is Azul Zing, a very serious product. It's one of the four major VM Jit compilers (OpenJ9, C2, Graal are the others in my opinion)

[1] https://www.azul.com/products/zing/

There are also PTC, Aicas, Virtenio, Ricoh and Gemalto all targeted to embededded deployments, of which, PTC and Aicas are the most well known ones.

Sadly Excelsior is no more. I imagine that regular JIT compilers making AOT/JIT caches available, is what killed them.

There are many implementations of C#, a few of them use LLVM, like Xamarin AOT, IL2CPP, Burst.

.NET Core and .NET Framework, do not.