Use NameOf with open generic types

I have a project which invokes late-bound calls on various methods/properties of a type inheriting from a generic base class. To guard against a breaking refactor, I use NameOf. This is all fine and good except I must specify a dummy class name in order to use NameOf.

Example:

```
Sub Main()
'workaround - no inherent value in having to specify type
Console.WriteLine(NameOf(Grover(Of Object).Lichen))

'preferable
Console.WriteLine(NameOf(Grover(Of ).Lichen))
End Sub

Public Class Grover(Of T)
Public Function Lichen() As Integer
Return 23
End Function
End Class
```

This change would result in a nice code cleanup. I imagine it could be a gnarly change for a relatively unusual case though!