/usr/lib/x86_64-linux-gnu/libLLVM-3.9.so

This file is indexed.

/usr/lib/x86_64-linux-gnu/libLLVM-3.9.so is in libllvm3.9 1:3.9.1-9.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/lib/x86_64-linux-gnu/libLLVM-3.9.so.1