The attached Java Fuzzer test crashes with the following assertion:

To reproduce:
$ java -Xcomp -XX:CompileOnly=Test Test.java
$ java -Xcomp -XX:CompileOnly=Reduced -XX:LoopMaxUnroll=0 -XX:-LoopUnswitching Reduced.java

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/opt/mach5/mesos/work_dir/slaves/ff806ead-2cac-495d-9cbc-62116f99bf14-S13700/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/8f731315-8676-4d9a-b759-a859429b8bf4/runs/73843d3e-ae06-4fbd-97ab-7296fb2593fc/workspace/open/src/hotspot/share/opto/loopopts.cpp:1488), pid=23439, tid=23453
# assert(!n->is_Store() && !n->is_LoadStore()) failed: no node with a side effect
#
# JRE version: Java(TM) SE Runtime Environment (18.0+26) (fastdebug build 18-ea+26-1787)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 18-ea+26-1787, compiled mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x13a089f] PhaseIdealLoop::try_sink_out_of_loop(Node*)+0xa0f
.........
Command Line: -Xmx1G -Xcomp -Xbatch -XX:CompileOnly=Test -XX:CompileCommand=quiet Test
.........
Current thread (0x00007fb2a43926f0): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=23453, stack(0x00007fb27acff000,0x00007fb27ae00000)]


Current CompileTask:
C2: 3859 18 % b 4 Test::mainTest @ 223 (683 bytes)

Stack: [0x00007fb27acff000,0x00007fb27ae00000], sp=0x00007fb27adf9e60, free space=1003k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x13a089f] PhaseIdealLoop::try_sink_out_of_loop(Node*)+0xa0f
V [libjvm.so+0x13a0a2c] PhaseIdealLoop::split_if_with_blocks_post(Node*)+0x5c
V [libjvm.so+0x13a17b1] PhaseIdealLoop::split_if_with_blocks(VectorSet&, Node_Stack&)+0x201
V [libjvm.so+0x1394993] PhaseIdealLoop::build_and_optimize(LoopOptsMode)+0x1333
V [libjvm.so+0xa9485a] PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x28a
V [libjvm.so+0xa910e8] Compile::Optimize()+0x15d8
V [libjvm.so+0xa92d9e] Compile::Compile(ciEnv*, ciMethod*, int, Options, DirectiveSet*)+0x159e
V [libjvm.so+0x8ab5a4] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x664
V [libjvm.so+0xaa3098] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xc88
V [libjvm.so+0xaa3e58] CompileBroker::compiler_thread_loop()+0x648
V [libjvm.so+0x192745a] JavaThread::thread_main_inner()+0x25a
V [libjvm.so+0x192f820] Thread::call_run()+0x100
V [libjvm.so+0x1611f24] thread_native_entry(Thread*)+0x104