C2: assert(iff->Opcode() == Op_If || iff->Opcode() == Op_CountedLoopEnd || iff->Opcode() == Op_RangeCheck) failed: Check this code when new subtype is added

The attached JavaFuzzer test fails with the following assertion:

To reproduce:
$ java java -XX:-TieredCompilation Test.java
$ java -Xbatch -XX:-TieredCompilation -XX:CompileOnly=Reduced Reduced.java

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/opt/mach5/mesos/work_dir/slaves/3c846bae-ce30-4a97-93ee-9fef4497ccb6-S124123/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/57294efe-464f-4c0a-b55a-fd67bfa32e7b/runs/71c23d41-87fd-4de4-92b5-4ba130c3e1dd/workspace/open/src/hotspot/share/opto/loopopts.cpp:237), pid=492453, tid=492466
# assert(iff->Opcode() == Op_If || iff->Opcode() == Op_CountedLoopEnd || iff->Opcode() == Op_RangeCheck) failed: Check this code when new subtype is added
#
# JRE version: Java(TM) SE Runtime Environment (18.0+7) (fastdebug build 18-ea+7-268)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 18-ea+7-268, mixed mode, sharing, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x12e63a3] PhaseIdealLoop::dominated_by(Node*, Node*, bool, bool)+0xd3
...........
Command Line: -XX:CompileCommand=quiet -XX:-TieredCompilation Test
...........
Current thread (0x00007f91e02b0b40): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=492466, stack(0x00007f9199cf8000,0x00007f9199df9000)]


Current CompileTask:
C2: 2894 108 ! Test::mainTest (1045 bytes)

Stack: [0x00007f9199cf8000,0x00007f9199df9000], sp=0x00007f9199df30a0, free space=1004k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x12e63a3] PhaseIdealLoop::dominated_by(Node*, Node*, bool, bool)+0xd3
V [libjvm.so+0x12b8423] PhaseIdealLoop::do_unswitching(IdealLoopTree*, Node_List&)+0x11b3
V [libjvm.so+0x12b2f0e] IdealLoopTree::iteration_split(PhaseIdealLoop*, Node_List&)+0x23e
V [libjvm.so+0x12b2d05] IdealLoopTree::iteration_split(PhaseIdealLoop*, Node_List&)+0x35
V [libjvm.so+0x12df1a8] PhaseIdealLoop::build_and_optimize(LoopOptsMode)+0xd58
V [libjvm.so+0x9fba3c] PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x28c
V [libjvm.so+0x9f8525] Compile::Optimize()+0x1475
V [libjvm.so+0x9f9ff4] Compile::Compile(ciEnv*, ciMethod*, int, bool, bool, bool, bool, bool, DirectiveSet*)+0x1564
V [libjvm.so+0x81a076] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x646
V [libjvm.so+0xa0aab9] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xef9
V [libjvm.so+0xa0b7e8] CompileBroker::compiler_thread_loop()+0x598
V [libjvm.so+0x186829c] JavaThread::thread_main_inner()+0x27c
V [libjvm.so+0x186eb90] Thread::call_run()+0x100
V [libjvm.so+0x1551464] thread_native_entry(Thread*)+0x104