/usr/src/gcc-7/debian/lib32asan4.symbols is in gcc-7-source 7.3.0-16ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | libasan.so.4 lib32asan4 #MINVER#
#include "libasan.symbols.common"
#include "libasan.symbols.32"
(arch=s390x)__interceptor___tls_get_addr_internal@Base 7
(arch=s390x)__interceptor___tls_get_offset@Base 7
(arch=s390x)__tls_get_addr_internal@Base 7
(arch=s390x)__tls_get_offset@Base 7
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