/usr/lib/x86_64-linux-gnu/libLLVM-4.0.so is in libllvm4.0 1:4.0-1ubuntu1~16.04.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libLLVM-4.0.so.1
/usr/lib/x86_64-linux-gnu/libLLVM-4.0.so.1