[DirectX] Refactor RootSignature Backend to remove `to_underlying` from Root Parameter Header#154249

joaosaffran merged 13 commits intollvm:mainllvm/llvm-project:mainfrom

joaosaffran:refactoring/add_enum_rs_internaljoaosaffran/llvm-project:refactoring/add_enum_rs_internalCopy head branch name to clipboard