/usr/share/llvm-3.5/ is in llvm-3.5-dev 1:3.5~svn201651-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/llvm-3.5/cmake/
/usr/share/llvm-3.5/cmake/AddLLVM.cmake
/usr/share/llvm-3.5/cmake/AddLLVMDefinitions.cmake
/usr/share/llvm-3.5/cmake/CheckAtomic.cmake
/usr/share/llvm-3.5/cmake/ChooseMSVCCRT.cmake
/usr/share/llvm-3.5/cmake/GetHostTriple.cmake
/usr/share/llvm-3.5/cmake/GetSVN.cmake
/usr/share/llvm-3.5/cmake/HandleLLVMOptions.cmake
/usr/share/llvm-3.5/cmake/HandleLLVMStdlib.cmake
/usr/share/llvm-3.5/cmake/LLVM-Config.cmake
/usr/share/llvm-3.5/cmake/LLVMParseArguments.cmake
/usr/share/llvm-3.5/cmake/LLVMProcessSources.cmake
/usr/share/llvm-3.5/cmake/TableGen.cmake
/usr/share/llvm-3.5/cmake/VersionFromVCS.cmake