/usr/share/doc/liblld-4.0/changelog.Debian.gz is in liblld-4.0 1:4.0-1ubuntu1~16.04.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/liblld-4.0/../libllvm4.0/changelog.Debian.gz
/usr/share/doc/liblld-4.0/../libllvm4.0/changelog.Debian.gz