C2 crashes in PhaseIdealLoop::split_up

# SIGSEGV (0xb) at pc=0x00007fad0dea1409, pid=10534, tid=10604
#
# JRE version: OpenJDK Runtime Environment (10.0.1+10) (build 10.0.1+10)
# Java VM: OpenJDK 64-Bit Server VM (10.0.1+10, mixed mode, tiered, compressed oops, concurrent mark sweep gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0xc48409] PhaseIdealLoop::split_up(Node*, Node*, Node*) [clone .part.40]+0x619

Current CompileTask:
C2:1566370 54692 s! 4 org.apache.lucene.index.ConcurrentMergeScheduler::merge (280 bytes)

Stack: [0x00007facec32d000,0x00007facec42e000], sp=0x00007facec428d60, free space=1007k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xc48409] PhaseIdealLoop::split_up(Node*, Node*, Node*) [clone .part.40]+0x619
V [libjvm.so+0xc4a464] PhaseIdealLoop::do_split_if(Node*)+0x854
V [libjvm.so+0xa1b957] PhaseIdealLoop::split_if_with_blocks(VectorSet&, Node_Stack&)+0xf7
V [libjvm.so+0xa15b26] PhaseIdealLoop::build_and_optimize(bool, bool)+0xe16
V [libjvm.so+0x63e511] Compile::Optimize()+0x981
V [libjvm.so+0x63fdbc] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool, DirectiveSet*)+0x10ac
V [libjvm.so+0x5654c2] C2Compiler::compile_method(ciEnv*, ciMethod*, int, DirectiveSet*)+0x1d2
V [libjvm.so+0x647b86] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x3d6
V [libjvm.so+0x648d1b] CompileBroker::compiler_thread_loop()+0x28b
V [libjvm.so+0xcd9a78] JavaThread::thread_main_inner()+0x108
V [libjvm.so+0xb5a6e2] thread_native_entry(Thread*)+0xf2
C [libpthread.so.0+0x76db] start_thread+0xdb

Reported by the Lucene Team, see https://issues.apache.org/jira/browse/LUCENE-8668
https://mail.openjdk.java.net/pipermail/hotspot-dev/2019-January/036524.html