355eb9c79f
Make create_dll_import_lib easier to implement This will make it easier to implement raw-dylib support in cg_clif and cg_gcc. This PR doesn't yet include an create_dll_import_lib implementation for cg_clif as I need to correctly implement dllimport in cg_clif first before raw-dylib can work at all with cg_clif. Required for https://github.com/rust-lang/rustc_codegen_cranelift/issues/1345
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.