/usr/bin/lli-child-target-4.0 is in llvm-4.0-runtime 1:4.0.1-10.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../lib/llvm-4.0/bin/lli-child-target
/usr/bin/../lib/llvm-4.0/bin/lli-child-target