Heads-up: sh/jdk CTW failure with Traversal

[Aleksey Shipilev]

Seems to be 100% reproducible with:

$ CONF=linux-x86_64-server-fastdebug make images run-test
TEST=applications/ctw/modules/jdk_management_agent.java TEST_VM_OPTS="-XX:-TieredCompilation
-XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=traversal
-XX:+ShenandoahVerifyOptoBarriers"

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error
(/home/shade/trunks/shenandoah-jdk/src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp:1606),
pid=27479, tid=27489
#  assert(is_dominator(phase->get_ctrl(pre_val), ctrl->in(0)->in(0), pre_val, ctrl->in(0), phase))
failed: can't move


-Aleksey