RFR: [8u] Increase timeout for EvilSyncBug test

[Aleksey Shipilev]

8u seems significantly slower in fastdebug than 9, and this test timeouts
intermittently. I propose we increase the timeout from 120 to 240 seconds.

$ hg diff
diff -r 6ee2dcaf8e98 test/gc/shenandoah/EvilSyncBug.java
--- a/test/gc/shenandoah/EvilSyncBug.java	Tue May 30 22:00:06 2017 +0200
+++ b/test/gc/shenandoah/EvilSyncBug.java	Tue May 30 22:01:10 2017 +0200
@@ -28,7 +28,7 @@
  * @library /testlibrary
  * @modules java.base/jdk.internal.misc
  *          java.management
- * @run driver EvilSyncBug
+ * @run driver/timeout=240 EvilSyncBug
  */

 import java.util.*;


-Aleksey