FYI: (Re-)Added missing read barrier in C2's inline_unsafe_ordered_store() intrinsic

[Roland Westrelin]

> This one fell under the table, probably because it's not present in
> jdk9.
> 
> http://hg.openjdk.java.net/shenandoah/jdk8u/hotspot/rev/c7ccb4a2b360

Thanks for fixing that.

Roland.