Issue 43307 in oss-fuzz: elfutils:fuzz-dwfl-core: Crash in read_addrs

[evv… via monorail]

Comment #2 on issue 43307 by evv...@gmail.com: elfutils:fuzz-dwfl-core: Crash in read_addrs
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=43307#c2

It can be reproduced by downloading the reproducer testcase and passing it to eu-stack:
```
autoreconf -i -f
./configure --enable-maintainer-mode --enable-sanitize-address --enable-sanitize-undefined
make -j$(nproc) V=1
wget -O oss-fuzz-43307 'https://oss-fuzz.com/download?testcase_id=4696722113167360'
LD_LIBRARY_PATH="./libdw;./libelf" ./src/stack --core ./oss-fuzz-43307
AddressSanitizer:DEADLYSIGNAL
=================================================================
==159086==ERROR: AddressSanitizer: SEGV on unknown address 0x7f1c426f6fe0 (pc 0x7f1c47758399 bp 0x60b000001170 sp 0x7ffdf9aca7a0 T0)
==159086==The signal is caused by a READ memory access.
    #0 0x7f1c47758399 in read_8ubyte_unaligned_noncvt ../libdw/memory-access.h:301
    #1 0x7f1c47758399 in read_addrs /home/vagrant/elfutils/libdwfl/link_map.c:288
    #2 0x7f1c47758399 in report_r_debug /home/vagrant/elfutils/libdwfl/link_map.c:341
    #3 0x7f1c47758399 in dwfl_link_map_report /home/vagrant/elfutils/libdwfl/link_map.c:1117
    #4 0x7f1c4775df31 in _new.dwfl_core_file_report /home/vagrant/elfutils/libdwfl/core-file.c:552
    #5 0x403b34 in parse_opt /home/vagrant/elfutils/src/stack.c:595
    #6 0x7f1c46802471 in argp_parse (/lib64/libc.so.6+0x11e471)
    #7 0x402a7d in main /home/vagrant/elfutils/src/stack.c:695
    #8 0x7f1c4671155f in __libc_start_call_main (/lib64/libc.so.6+0x2d55f)
    #9 0x7f1c4671160b in __libc_start_main_impl (/lib64/libc.so.6+0x2d60b)
    #10 0x402f44 in _start (/home/vagrant/elfutils/src/stack+0x402f44)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV ../libdw/memory-access.h:301 in read_8ubyte_unaligned_noncvt
==159086==ABORTING
```

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