RFR(S): 8248598: [Graal] Several testcases from applications/jcstress/acqrel.java fails with forbidden state

[Roland Westrelin]

http://cr.openjdk.java.net/~roland/8248598/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8248598

It's the upstream graal fix from
https://github.com/oracle/graal/pull/2651 unmodifiered.

I wanted to verify that the test case once part of the jdk source tree
does fail without the fix and runs fine with it but couldn't figure out
how. What are the steps for that?

Roland.