8273803: Zero: Handle "zero" variant in CommandLineOptionTest.java

Reviewed-by: dholmes

test/lib/jdk/test/lib/cli/CommandLineOptionTest.java

@@ -500,6 +500,8 @@ public abstract class CommandLineOptionTest {
             return "-client";
         } else if (Platform.isMinimal()) {
             return "-minimal";
+        } else if (Platform.isZero()) {
+            return "-zero";
         }
         throw new RuntimeException("Unknown VM mode.");
     }