/usr/share/llvm-3.6/ is in llvm-3.6-dev 1:3.6.2-3ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/llvm-3.6/cmake/
/usr/share/llvm-3.6/cmake/AddLLVM.cmake
/usr/share/llvm-3.6/cmake/AddLLVMDefinitions.cmake
/usr/share/llvm-3.6/cmake/AddOCaml.cmake
/usr/share/llvm-3.6/cmake/AddSphinxTarget.cmake
/usr/share/llvm-3.6/cmake/ChooseMSVCCRT.cmake
/usr/share/llvm-3.6/cmake/CrossCompile.cmake
/usr/share/llvm-3.6/cmake/FindOCaml.cmake
/usr/share/llvm-3.6/cmake/FindSphinx.cmake
/usr/share/llvm-3.6/cmake/GetSVN.cmake
/usr/share/llvm-3.6/cmake/HandleLLVMOptions.cmake
/usr/share/llvm-3.6/cmake/HandleLLVMStdlib.cmake
/usr/share/llvm-3.6/cmake/LLVM-Config.cmake
/usr/share/llvm-3.6/cmake/LLVMConfig.cmake
/usr/share/llvm-3.6/cmake/LLVMConfigVersion.cmake
/usr/share/llvm-3.6/cmake/LLVMExports.cmake
/usr/share/llvm-3.6/cmake/LLVMParseArguments.cmake
/usr/share/llvm-3.6/cmake/LLVMProcessSources.cmake
/usr/share/llvm-3.6/cmake/TableGen.cmake