/usr/lib/ghc-doc/hoogle/llvm-base.txt is in libghc-llvm-base-doc 3.2.0.0-3ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-llvm-base-doc/html/llvm-base.txt