Trim virtual method bodies if they are not called via base and the type itself is not constructed.

[teo-tsirpanis]

Let's say that we have the following code:

using System.Text.RegularExpressions;

Console.WriteLine(new Derived().Get().IsMatch("226"));

public class Base
{
    public virtual Regex Get() => new Regex(@"\d+");
}

public partial class Derived : Base
{
    [RegexGenerator(@"\d+")]
    private static partial Regex GetRegex();

    public override Regex Get() => GetRegex();
}

Base.Get is never called because first, we don't do new Base() anywhere and second, descendants of Base do not call base.Get(). Its method body is preserved however after trimming. The linker could recognize that and trim it away.