test-hmp fails on aarch64 target when CFI is enabled
Description of problem:
QEMU crashes during test-hmp when CFI is enabled
Steps to reproduce:
1. ../qemu/configure --cc=clang --cxx=clang++ --enable-cfi --enable-cfi-debug --enable-safe-stack --disable-slirp --target-list=aarch64-softmmu --disable-docs
2. make -j$(nproc)
3. V=2 QTEST_QEMU_BINARY=./qemu-system-aarch64 tests/qtest/test-hmp --verbose
Additional information:
The error messages look like this:
```
	info qtree
UndefinedBehaviorSanitizer:DEADLYSIGNAL
==677987==ERROR: UndefinedBehaviorSanitizer: SEGV on unknown address (pc 0x55fec2a3b7ce bp 0x7feef35ff970 sp 0x7fffbc8acd20 T677987)
==677987==The signal is caused by a READ memory access.
==677987==Hint: this fault was caused by a dereference of a high value address (see register values below).  Disassemble the provided pc to learn which register was used.
    #0 0x55fec2a3b7ce in start_list.83665.cfi /tmp/qemu-cfi/../../home/thuth/devel/qemu/qapi/string-output-visitor.c:291:18
    #1 0x55fec2a34dbe in visit_start_list /tmp/qemu-cfi/../../home/thuth/devel/qemu/qapi/qapi-visit-core.c:80:10
    #2 0x55fec27dcb58 in get_prop_array.cfi /tmp/qemu-cfi/../../home/thuth/devel/qemu/hw/core/qdev-properties.c:698:10
    #3 0x55fec27e7173 in object_property_get /tmp/qemu-cfi/../../home/thuth/devel/qemu/qom/object.c:1415:5
    #4 0x55fec27e87a4 in object_property_print /tmp/qemu-cfi/../../home/thuth/devel/qemu/qom/object.c:1692:10
    #5 0x55fec224dd72 in qdev_print_props /tmp/qemu-cfi/../../home/thuth/devel/qemu/system/qdev-monitor.c:761:21
    #6 0x55fec224dd72 in qdev_print /tmp/qemu-cfi/../../home/thuth/devel/qemu/system/qdev-monitor.c:813:9
    #7 0x55fec224dd72 in qbus_print /tmp/qemu-cfi/../../home/thuth/devel/qemu/system/qdev-monitor.c:831:9
    #8 0x55fec22bd945 in handle_hmp_command_exec /tmp/qemu-cfi/../../home/thuth/devel/qemu/monitor/hmp.c:1106:9
    #9 0x55fec22bcfeb in handle_hmp_command /tmp/qemu-cfi/../../home/thuth/devel/qemu/monitor/hmp.c:1158:9
    #10 0x55fec22c020e in qmp_human_monitor_command /tmp/qemu-cfi/../../home/thuth/devel/qemu/monitor/qmp-cmds.c:182:5
    #11 0x55fec29cfe0b in qmp_marshal_human_monitor_command.cfi /tmp/qemu-cfi/qapi/qapi-commands-misc.c:347:14
    #12 0x55fec2a3c470 in do_qmp_dispatch_bh.cfi /tmp/qemu-cfi/../../home/thuth/devel/qemu/qapi/qmp-dispatch.c:128:5
    #13 0x55fec2a63fc4 in aio_bh_call /tmp/qemu-cfi/../../home/thuth/devel/qemu/util/async.c:169:5
    #14 0x55fec2a6418f in aio_bh_poll /tmp/qemu-cfi/../../home/thuth/devel/qemu/util/async.c:216:13
    #15 0x55fec2a49deb in aio_dispatch /tmp/qemu-cfi/../../home/thuth/devel/qemu/util/aio-posix.c:423:5
    #16 0x55fec2a64ffa in aio_ctx_dispatch.cfi /tmp/qemu-cfi/../../home/thuth/devel/qemu/util/async.c:358:5
    #17 0x7feef8d6ae5b  (/lib64/libglib-2.0.so.0+0x5be5b) (BuildId: c5377a60d8282e2a61a4af1201dc10c9666139c2)
    #18 0x7feef8d6b124 in g_main_context_dispatch (/lib64/libglib-2.0.so.0+0x5c124) (BuildId: c5377a60d8282e2a61a4af1201dc10c9666139c2)
    #19 0x55fec2a6656b in glib_pollfds_poll /tmp/qemu-cfi/../../home/thuth/devel/qemu/util/main-loop.c:290:9
    #20 0x55fec2a6656b in os_host_main_loop_wait /tmp/qemu-cfi/../../home/thuth/devel/qemu/util/main-loop.c:313:5
    #21 0x55fec2a6656b in main_loop_wait /tmp/qemu-cfi/../../home/thuth/devel/qemu/util/main-loop.c:592:11
    #22 0x55fec22553e6 in qemu_main_loop /tmp/qemu-cfi/../../home/thuth/devel/qemu/system/runstate.c:782:9
    #23 0x55fec27da3f5 in qemu_default_main.cfi /tmp/qemu-cfi/../../home/thuth/devel/qemu/system/main.c:37:14
    #24 0x7feef7aff149 in __libc_start_call_main (/lib64/libc.so.6+0x28149) (BuildId: 651b2bed7ecaf18098a63b8f10299821749766e6)
    #25 0x7feef7aff20a in __libc_start_main@GLIBC_2.2.5 (/lib64/libc.so.6+0x2820a) (BuildId: 651b2bed7ecaf18098a63b8f10299821749766e6)
    #26 0x55fec1e865b4 in _start (/tmp/qemu-cfi/qemu-system-aarch64+0x5435b4) (BuildId: c8a2f51d83ddef5c97f11783d94381f60c82c2ac)

UndefinedBehaviorSanitizer can not provide additional info.
SUMMARY: UndefinedBehaviorSanitizer: SEGV /tmp/qemu-cfi/../../home/thuth/devel/qemu/qapi/string-output-visitor.c:291:18 in start_list.83665.cfi
==677987==ABORTING
Broken pipe
../../home/thuth/devel/qemu/tests/qtest/libqtest.c:195: kill_qemu() tried to terminate QEMU process but encountered exit status 1 (expected 0)
Aborted (core dumped)
```