New slot virtuals should be handled as separate methods and not overrides of the base

```C#
class Base
{
[RequiresUnreferencedCode("Base")]
public virtual void Method() {}
}

class Derived
{
[RequiresUnreferencedCode("Derived")]
public virtual void Method() {}
}

void Test()
{
// Should produce two warnings
// IL2026 .... Base
// IL2026 .... Derived
typeof(Derived).GetMethods();
}
```

Currently trimmer only reports the "Base" warning in this case. Analyzer reports both (correctly).
If the derived method was an `override` then only the "Base" warning should be generated.