CTW fails on AArch64 with this:

$ export JAVA_HOME=<point to fastdebug build>
$ export PATH=$JAVA_HOME/bin:$PATH
$ cd test/hotspot/jtreg/testlibrary/ctw
$ make
$ cd dist
$ wget https://repo1.maven.org/maven2/com/github/tianjing/tgtools.core/1.1.3/tgtools.core-1.1.3.jar
$ ./ctw.sh tgtools.core-1.1.3.jar

 7611 Node === _ [[ ]] [30120000007611]
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/shipilev/shipilev-jdk/src/hotspot/share/opto/output.cpp:2974), pid=24734, tid=24748
# assert(false) failed: too many D-U pinch points: 7611 >= 7611
#
# JRE version: OpenJDK Runtime Environment (23.0) (fastdebug build 23-internal-adhoc.shipilev.shipilev-jdk)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 23-internal-adhoc.shipilev.shipilev-jdk, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, linux-aarch64)
# Problematic frame:
# V [libjvm.so+0x13c5e8c] Scheduling::anti_do_def(Block*, Node*, int, int) [clone .part.247]+0x4c4
#
# No core dump will be written. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#

Current CompileTask:
C2:5906 3357 !b 4 tgtools.net.udp.UDPClient::main (294 bytes)

Stack: [0x0000fffc935c0000,0x0000fffc937c0000], sp=0x0000fffc937bb3c0, free space=2028k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x13347a8] Scheduling::anti_do_def(Block*, Node*, int, int) [clone .part.0]+0x8f4 (output.cpp:2974)
V [libjvm.so+0x133a758] Scheduling::ComputeRegisterAntidependencies(Block*)+0xc78 (output.cpp:3093)
V [libjvm.so+0x133acd0] Scheduling::DoScheduling()+0x350 (output.cpp:2786)
V [libjvm.so+0x1344790] PhaseOutput::ScheduleAndBundle() [clone .part.0]+0xa0 (output.cpp:2148)
V [libjvm.so+0x13453f0] PhaseOutput::Output()+0xa00 (output.cpp:2137)
V [libjvm.so+0x8dd11c] Compile::Code_Gen()+0x3f8 (compile.cpp:3031)
V [libjvm.so+0x8df2c8] Compile::Compile(ciEnv*, ciMethod*, int, Options, DirectiveSet*)+0x1584 (compile.cpp:894)
V [libjvm.so+0x739b90] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x17c (c2compiler.cpp:142)
V [libjvm.so+0x8eaf4c] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x7cc (compileBroker.cpp:2305)
V [libjvm.so+0x8ebb04] CompileBroker::compiler_thread_loop()+0x584 (compileBroker.cpp:1964)
V [libjvm.so+0xd64c3c] JavaThread::thread_main_inner()+0xcc (javaThread.cpp:721)
V [libjvm.so+0x15ae880] Thread::call_run()+0xac (thread.cpp:221)
V [libjvm.so+0x131d524] thread_native_entry(Thread*)+0x130 (os_linux.cpp:864)
C [libpthread.so.0+0x7950] start_thread+0x190