The attached fuzzer test fails with the following assertion:

To reproduce:
# java -Xcomp -XX:-TieredCompilation -XX:CompileOnly=Test Test.java

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/opt/mach5/mesos/work_dir/slaves/983c483a-6907-44e0-ad29-98c7183575e2-S14469/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/5986f74f-93ba-4d44-baaf-79d9af86790f/runs/ec853337-5fd8-4ef2-b3ea-1559f628e816/workspace/open/src/hotspot/share/opto/type.hpp:1613), pid=31055, tid=31068
# assert(_base == Int) failed: Not an Int
#
# JRE version: Java(TM) SE Runtime Environment (16.0+32) (fastdebug build 16-ea+32-2190)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 16-ea+32-2190, compiled mode, sharing, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x1621164] PhaseIterGVN::no_dependent_zero_check(Node*) const+0x144
...........
Command Line: -Xmx1G -Xcomp -Xbatch -XX:-TieredCompilation -XX:CompileOnly=Test -XX:CompileCommand=quiet Test
...........
Current thread (0x00007f6164495ac0): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=31068, stack(0x00007f6154043000,0x00007f6154144000)]


Current CompileTask:
C2: 329 5 !b Test::iMeth (323 bytes)

Stack: [0x00007f6154043000,0x00007f6154144000], sp=0x00007f615413f3d0, free space=1008k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x1621164] PhaseIterGVN::no_dependent_zero_check(Node*) const+0x144
V [libjvm.so+0xe045fb] IfNode::dominated_by(Node*, PhaseIterGVN*)+0x37b
V [libjvm.so+0x16255bd] PhaseIterGVN::transform_old(Node*)+0xed
V [libjvm.so+0x161ddbe] PhaseIterGVN::optimize()+0x7e
V [libjvm.so+0xa168e6] Compile::Optimize()+0x216
V [libjvm.so+0xa19988] Compile::Compile(ciEnv*, ciMethod*, int, bool, bool, bool, bool, DirectiveSet*)+0x1838
V [libjvm.so+0x849aec] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x1dc
V [libjvm.so+0xa29798] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xe88
V [libjvm.so+0xa2a3e8] CompileBroker::compiler_thread_loop()+0x5a8
V [libjvm.so+0x18ba936] JavaThread::thread_main_inner()+0x256
V [libjvm.so+0x18c12b0] Thread::call_run()+0x100
V [libjvm.so+0x15a3486] thread_native_entry(Thread*)+0x116