/usr/share/lintian/overrides/libllvm6.0 is in libllvm6.0 1:6.0-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # That is normal. Upstream does not match the debian convention
libllvm6.0: package-name-doesnt-match-sonames libLLVM-6.0-1
|