/usr/share/llvm-3.8/ is in llvm-3.8-dev 1:3.8-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/llvm-3.8/cmake/
/usr/share/llvm-3.8/cmake/AddLLVM.cmake
/usr/share/llvm-3.8/cmake/AddLLVMDefinitions.cmake
/usr/share/llvm-3.8/cmake/AddOCaml.cmake
/usr/share/llvm-3.8/cmake/AddSphinxTarget.cmake
/usr/share/llvm-3.8/cmake/ChooseMSVCCRT.cmake
/usr/share/llvm-3.8/cmake/CrossCompile.cmake
/usr/share/llvm-3.8/cmake/DetermineGCCCompatible.cmake
/usr/share/llvm-3.8/cmake/FindOCaml.cmake
/usr/share/llvm-3.8/cmake/FindSphinx.cmake
/usr/share/llvm-3.8/cmake/GetSVN.cmake
/usr/share/llvm-3.8/cmake/HandleLLVMOptions.cmake
/usr/share/llvm-3.8/cmake/HandleLLVMStdlib.cmake
/usr/share/llvm-3.8/cmake/LLVM-Config.cmake
/usr/share/llvm-3.8/cmake/LLVMConfig.cmake
/usr/share/llvm-3.8/cmake/LLVMConfigVersion.cmake
/usr/share/llvm-3.8/cmake/LLVMExports-relwithdebinfo.cmake
/usr/share/llvm-3.8/cmake/LLVMExports.cmake
/usr/share/llvm-3.8/cmake/LLVMExternalProjectUtils.cmake
/usr/share/llvm-3.8/cmake/LLVMInstallSymlink.cmake
/usr/share/llvm-3.8/cmake/LLVMProcessSources.cmake
/usr/share/llvm-3.8/cmake/TableGen.cmake