Print exception trace inside Kit.codeBug() to have it even if the execption is shadowed by another one

git-svn-id: svn://10.0.0.236/trunk@161826 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/js/rhino/src/org/mozilla/javascript/Kit.java

@@ -397,7 +397,10 @@ public class Kit
     public static RuntimeException codeBug()
         throws RuntimeException
     {
-        throw new IllegalStateException("FAILED ASSERTION");
+        RuntimeException ex = new IllegalStateException("FAILED ASSERTION");
+        // Print stack trace ASAP
+        ex.printStackTrace(System.err);
+        throw ex;
     }
 }