RFR (XS) 8220712: [TESTBUG] gc/shenandoah/compiler/TestMaybeNullUnsafeAccess should run with Shenandoah enabled

[Aleksey Shipilev]

Testbug:
  https://bugs.openjdk.java.net/browse/JDK-8220712

Fix:

diff -r 1def2d745747 -r 64c61d4df33c
test/hotspot/jtreg/gc/shenandoah/compiler/TestMaybeNullUnsafeAccess.java
--- a/test/hotspot/jtreg/gc/shenandoah/compiler/TestMaybeNullUnsafeAccess.java  Mon Mar 11 17:34:23
2019 +0530
+++ b/test/hotspot/jtreg/gc/shenandoah/compiler/TestMaybeNullUnsafeAccess.java  Fri Mar 15 10:05:45
2019 +0100
@@ -28,7 +28,12 @@
  * @requires vm.gc.Shenandoah
  * @modules java.base/jdk.internal.misc:+open
  *
- * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:-TieredCompilation
TestMaybeNullUnsafeAccess
+ * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:-TieredCompilation
+ *                   TestMaybeNullUnsafeAccess
+ *
+ * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:-TieredCompilation
+ *                   -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC
+ *                   TestMaybeNullUnsafeAccess
  *
  */

Testing: gc/shenandoah/compiler/ (includes the affected test) on Linux x86_64 {fastdebug|release}

Thanks,
-Aleksey