RFR(T): 8216482: Shenandoah: typo in ShenandoahBarrierSetC2::clone_barrier_at_expansion() causes failed compilations

[Roland Westrelin]

> Shenandoah is build by default, right? And there are some tests that set -XX:+UseShenandoahGC, not
> sure though if they are executed with the submit repo.

Right, but there is this:

https://bugs.openjdk.java.net/browse/JDK-8215030
"Disable shenandoah in Oracle builds"

Roland.