ZGC: SEGV in MetaspaceShared::link_shared_classes

Test: runtime/cds/appcds/javaldr/GCDuringDump.java

#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x0000000109c92fd8, pid=49600, tid=6147
#
# JRE version: Java(TM) SE Runtime Environment (18.0+18) (fastdebug build 18-ea+18-1045)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 18-ea+18-1045, interpreted mode, tiered, compressed class ptrs, z gc, bsd-aarch64)
# Problematic frame:
# V [libjvm.dylib+0xc92fd8] MetaspaceShared::link_shared_classes(JavaThread*)+0x1a4

--------------- T H R E A D ---------------

Current thread (0x0000000113008a20): JavaThread "main" [_thread_in_vm, id=6147, stack(0x000000016b688000,0x000000016b88b000)]

Stack: [0x000000016b688000,0x000000016b88b000], sp=0x000000016b88a930, free space=2058k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.dylib+0xc92fd8] MetaspaceShared::link_shared_classes(JavaThread*)+0x1a4
V [libjvm.dylib+0xc93630] MetaspaceShared::preload_and_dump_impl(JavaThread*)+0x9c
V [libjvm.dylib+0xc931d4] MetaspaceShared::preload_and_dump()+0x50
V [libjvm.dylib+0xf7bd44] Threads::create_vm(JavaVMInitArgs*, bool*)+0xc08
V [libjvm.dylib+0x9062f4] JNI_CreateJavaVM+0xa8
C [libjli.dylib+0x49a4] JavaMain+0x104
C [libjli.dylib+0x7570] ThreadJavaMain+0xc
C [libsystem_pthread.dylib+0x706c] _pthread_start+0x140


siginfo: si_signo: 11 (SIGSEGV), si_code: 2 (SEGV_ACCERR), si_addr: 0xbababababababac6

Looks very similar to the crash in JDK-8273505