/usr/share/doc/llvm-3.0/changelog.Debian.gz is in llvm-3.0 3.0-4ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/llvm-3.0/../libllvm3.0/changelog.Debian.gz
/usr/share/doc/llvm-3.0/../libllvm3.0/changelog.Debian.gz