Pass ByRef parameters of parent into hoisted function by ref

[TymurGubayev]

Problem

Input:

Sub S(ByRef x As Integer)
    Dim i As Integer = 0
    If F1(x, i) Then
    End If
End Sub

Function F1(x As Integer, ByRef o As Object) As Boolean : End Function

Erroneous output:

public void S(ref int x)
{
    int i = 0;
    //CS1628: Cannot use ref, out, or in parameter 'x' inside an anonymous method, lambda expression, query expression, or local function
    bool localF1() { object argo = i; var ret = F1(x, ref argo); i = Conversions.ToInteger(argo); return ret; }

    if (localF1())
    {
    }
}

public bool F1(int x, ref object o)
{
    return default;
}

Solution

• Any comments on the approach taken, its consistency with surrounding code, etc.
  Analyze arguments in HoistAndCallLocalFunctionAsync, if any are ByRef parameters, create an ArgumentList an a ParameterList to use in the local function we are about to create.
• Which part of this PR is most in need of attention/improvement?
  Currently, I'm passing null for the ParameterList from CommonConversions.cs/ConvertEqualsValueClauseSyntaxAsync() - so there is no change in behavior. It might be worth analyzing what happens there and maybe make a similar adjustment (I haven't spent much time on that).
• At least one test covering the code changed