8266877: Missing local debug information when debugging JEP-330

Reviewed-by: alanb, jjg

src/jdk.compiler/share/classes/com/sun/tools/javac/launcher/Main.java

@@ -342,6 +342,9 @@ public class Main {
                     }
                     break;
                 default:
+                    if (opt.startsWith("-agentlib:jdwp=") || opt.startsWith("-Xrunjdwp:")) {
+                        javacOpts.add("-g");
+                    }
                     // ignore all other runtime args
             }
         }