GetType, Equals, GetHashCode on interfaces

```
To call one of these methods I need to cast my object to typeof(object). 

Example:
Operand l=g.Local(typeof(IList),Exp.New(typeof(List<int>())));
g.If(l.Invoke("GetType")==typeof(List<int>));
{
...
}
g.End();

But works only:
g.If(l.Cast(typeof(object)).Invoke("GetType")==typeof(List<int>));
```

Original issue reported on code.google.com by `vlad....@gmail.com` on 19 Jan 2013 at 8:02
