Type.IsAssignableFrom() returns false for (delegate type) -> Delegate check

[iskiselev]

Here is test case:

using System;

public static class Program
{
    public static void Main(string[] args)
    {
        Console.WriteLine(typeof(Delegate).IsAssignableFrom(typeof(Action)) ? "true" : "false");
        Console.WriteLine(typeof(MulticastDelegate).IsAssignableFrom(typeof(Action)) ? "true" : "false");
        Console.WriteLine(typeof(Delegate).IsAssignableFrom(typeof(MulticastDelegate)) ? "true" : "false");
    }
}

[iskiselev]

Looks like is duplicate with #499, that should be fixed with PR #501 - but I don't understand what happened with it.

[iskiselev]

Works now. Test to be added.