AsyncV1 NAOT stacktrace noise

For the following app compiled with runtime-async off
```csharp
public class Program
{
public static async Task Main()
{
throw new Exception("exception from Main");
}
}
```

The CoreCLR stack trace is as follows:
```
Unhandled exception. System.Exception: exception from Main
at Program.()
```

And the NAOT stack trace is as follows:
```
Unhandled exception. System.Exception: exception from Main
at Program.d__0.MoveNext()
--- End of stack trace from previous location ---
at Program.()
```
Note especially the extraneous `--- End of stack trace from previous location ---`