This adresses point 2 from https://github.com/llvm/llvm-project/issues/156680. Also add a dummy object that serves as an alias to `SPELLING_CACHE`, used to replicate the old behavior and throw a `DeprecationWarning`.
This adresses point 2 from https://github.com/llvm/llvm-project/issues/156680. Also add a dummy object that serves as an alias to `SPELLING_CACHE`, used to replicate the old behavior and throw a `DeprecationWarning`.