[llvm] [mlir] [LLVM][MLIR] Move LSP server support library from MLIR into LLVM (PR #157885)

[Michał Górny via llvm-commits]

mgorny wrote:

I can try to help (since I can reproduce it reliably), but I'd need some hints what to look at. The tests look quite opaque to me.

https://github.com/llvm/llvm-project/pull/157885