[9] RFR (XS): JDK-8151020: [TESTBUG] UnsafeGetStableArrayElement::testL_* fail intermittently

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8151020/webrev.00
https://bugs.openjdk.java.net/browse/JDK-8151020

Some cases in UnsafeGetStableArrayElement are not reliable: there's no 
way to ensure that only some part of an OOP is 0 or not.

The fix is just to run the tests (hoping to trigger an assertion if 
anything goes wrong) w/o checking the results.

Testing: ensured that the test still works.

Thanks!

Best regards,
Vladimir Ivanov