/usr/share/doc/llvm-3.1-examples/changelog.Debian.gz is in llvm-3.1-examples 3.1-2ubuntu1~12.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/llvm-3.1-examples/../libllvm3.1/changelog.Debian.gz