RFR (S) 8215724: Epsilon: ArrayStoreExceptionTest.java fails; missing arraycopy check

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8215724

Fix:
  http://cr.openjdk.java.net/~shade/8215724/webrev.01/

As mentioned in the bug, Epsilon deliberately reuses the super-class BarrierSet, thus implicitly
verifying it does the sane thing. This is one of those cases where super-class BarrierSet does not
checkcast, while it should.

Testing: Linux x86_64 fastdebug {new test, gc/epsilon, hotspot tier1}, jdk-submit (running)

Thanks,
-Aleksey

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