[Proposal] Allow Select Case to compare Object references

This Code gives me a runtime exception, as it is assumed to use `=` in comparing the objects:
```VB.NET
Select Case e.OriginalSource
Case Me, Me.TexTBox
cmb.IsDropDownOpen = Not cmb.IsDropDownOpen
End Select
```

So, this is Ok, but at least allow us to use `Is`. It is already used in some cases like `Case Is < 10`, but the next code is not accepted, and I think it should be:
```VB.NET
Select Case e.OriginalSource
Case Is Me, Is Me.TexTBox
cmb.IsDropDownOpen = Not cmb.IsDropDownOpen
End Select
```

The only valid way is:
```VB.NET
Select Case e.OriginalSource.GetType
Case Me.GetType, Me.TexTBox.GetType
cmb.IsDropDownOpen = Not cmb.IsDropDownOpen
End Select
```

Which is verbose and involving calling three methods!