Bug: C2 crash on Derby with -XX:-ShenandoahNoBarriersForConst

[Aleksey Shipilev]

Even after the recent Roland's fix, Derby fails with ShNoBarriersForConst:

$ java -jar target/benchmarks.jar Derby --jvmArgs "-XX:+UseShenandoahGC -Xmx4g
-Xms4g -XX:+UnlockExperimentalVMOptions -XX:-ShenandoahNoBarriersForConst" -f 1 -t 8

http://cr.openjdk.java.net/~shade/shenandoah/crashes/derby-noconst/hs_err_pid28482.log

http://cr.openjdk.java.net/~shade/shenandoah/crashes/derby-noconst/replay_pid28482.log

Thanks,
-Aleksey