RSRP-293020: Transform out parameters: deal with VB.NET ByRef parameters

Module Module1

    Sub Main()
        Dim x = 12
        Foo(x)
        Foo(x)

        Console.WriteLine(x) ' <~ prints 14
    End Sub

    Sub Foo(ByRef x As Integer)
        x = x + 1
    End Sub

End Module

After:

Module Module1

    Sub Main()
        Dim x = 12
        x = Foo()
        x = Foo()

        Console.WriteLine(x) ' <~ prints 1
    End Sub

    Function Foo() As Integer
        Dim x As Integer
        x = x + 1
        Return x
    End Function

End Module

VB.NET ByRef parameters are equal to C# ref-parameters, not out-parameters (they are not presented in VB.NET at all). So it's not possible to use the same C# technique to transform ByRef parameters (only when ByRef parameter has no any of read usages before return value assignment).

I think it's possible to extend refactoring to support ByRef-parameters (and in C# version too), simply by turning them into ByVal parameters when needed.