Found this assert/crash from the Lucene CI when looking for another assert.

https://jenkins.thetaphi.de/job/Lucene-Solr-8.0-Linux/194/

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/buildbot/worker/jdk12u-linux/build/src/hotspot/share/opto/split_if.cpp:322), pid=20957, tid=21005
# assert(prior_n->is_Region()) failed: must be a post-dominating merge point
#
# JRE version: OpenJDK Runtime Environment (12.0) (fastdebug build 12-testing+0-builds.shipilev.net-openjdk-jdk12-b109-20190215-jdk-1229)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 12-testing+0-builds.shipilev.net-openjdk-jdk12-b109-20190215-jdk-1229, mixed mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x17da240] PhaseIdealLoop::spinup(Node*, Node*, Node*, Node*, Node*, small_cache*) [clone .part.43]+0x330
#
# No core dump will be written. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#