/usr/share/doc/libclang-3.5-dev/changelog.Debian.gz is in libclang-3.5-dev 1:3.5~svn201651-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libclang-3.5-dev/../libllvm3.5/changelog.Debian.gz