Imported Upstream version 5.20.0.180

Former-commit-id: ff953ca879339fe1e1211f7220f563e1342e66cb

mcs/class/System.ServiceModel/Dummy_XM_4_5.cs

@@ -149,4 +149,38 @@ namespace System.ServiceModel.Description
 namespace System.ServiceModel.Channels
 {
 	public interface ITransportTokenAssertionProvider {}
+}
+
+namespace System.ServiceModel
+{
+	internal static class DiagnosticUtility
+	{
+		internal static class ExceptionUtility
+		{
+			internal static ArgumentException ThrowHelperArgument (string message)
+			{
+				return (ArgumentException)ThrowHelperError (new ArgumentException (message));
+			}
+
+			internal static ArgumentException ThrowHelperArgument (string paramName, string message)
+			{
+				return (ArgumentException)ThrowHelperError (new ArgumentException (message, paramName));
+			}
+
+			internal static ArgumentNullException ThrowHelperArgumentNull (string paramName)
+			{
+				return (ArgumentNullException)ThrowHelperError (new ArgumentNullException (paramName));
+			}
+
+			internal static Exception ThrowHelperError (Exception exception)
+			{
+				return exception;
+			}
+
+			internal static Exception ThrowHelperWarning (Exception exception)
+			{
+				return exception;
+			}
+		}
+	}
 }