Skip functions that pass structs or arrays by value

[Liudmila Kornilova]

Compilation of generated code causes scala.scalanative.util.UnreachableException

[Liudmila Kornilova]

Compilation of following function will cause exception:

def acceptStruct(arr: CStruct1[CInt]): Unit = // ...

But these example will not:

def acceptArray(arr: CArray[CInt, Nat._5]): Unit = // ...

If we try to call this function then compiler will throw UnsupportedException: can't cast from Array(Int,5) to Array(Class(Top(java.lang.Object)),0)

[Liudmila Kornilova]

Also native functions may return structs but exception is thrown when we try to compile code that uses returned value