C#: Use nameof

Author: tamasvajk

csharp/extractor/Semmle.Util/Logger.cs

@@ -129,7 +129,7 @@ private static string GetSeverityPrefix(Severity s)
                 case Severity.Error:
                     return "Error: ";
                 default:
-                    throw new ArgumentOutOfRangeException("s");
+                    throw new ArgumentOutOfRangeException(nameof(s));
             }
         }
 
@@ -188,7 +188,7 @@ public static bool Includes(this Verbosity v, Severity s)
                 case Severity.Error:
                     return v >= Verbosity.Error;
                 default:
-                    throw new ArgumentOutOfRangeException("s");
+                    throw new ArgumentOutOfRangeException(nameof(s));
             }
         }
     }