The C API don't have the bindings to create enumerators, needed to create an enumeration.
It seem to also miss macro related bindings, I'll probably make another differential today.
I don't have commit rights, I'd be glad if someone could commit this.
I keep a running list of the APIs we have wrapped if that helps. I would love a hand getting us all the way there https://github.com/llvm-swift/LLVMSwift/issues/131