nil in native hits LLVM assert "Invalid cast!"

[jruderman]

native "cdecl" mod libc = "" {
    fn f(x: ());
}
fn main() { }

fails in LLVM:

Assertion failed: (castIsValid(op, S, Ty) && "Invalid cast!"), function Create, file Instructions.cpp, line 2226.

[marijnh]

I don't think this is supposed to be allowed (you can only pass word-sized things to natives). I agree we should catch it with a proper error message.