Selected a better exception to throw in NamedTypeHelpers (GetNameOrIdentifier)

Author: bjornhellander

StyleCop.Analyzers/StyleCop.Analyzers/Helpers/NamedTypeHelpers.cs

@@ -93,7 +93,7 @@ internal static string GetNameOrIdentifier(MemberDeclarationSyntax member)
                     return ((DelegateDeclarationSyntax)member).Identifier.Text;
 
                 default:
-                    throw new InvalidOperationException("Unhandled declaration kind: " + member.Kind());
+                    throw new ArgumentException("Unhandled declaration kind: " + member.Kind());
             }
         }