[DirectX] Removing dxbc RootSignature and RootDescriptor from mcbxdc#154585

joaosaffran merged 16 commits intollvm:mainllvm/llvm-project:mainfrom

joaosaffran:refactor/remove-object-constant-descriptorjoaosaffran/llvm-project:refactor/remove-object-constant-descriptorCopy head branch name to clipboard