/usr/lib/llvm-3.5/include/clang/Driver/ is in libclang-3.5-dev 1:3.5-4ubuntu2~trusty2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/llvm-3.5/include/clang/Driver/Action.h
/usr/lib/llvm-3.5/include/clang/Driver/Compilation.h
/usr/lib/llvm-3.5/include/clang/Driver/Driver.h
/usr/lib/llvm-3.5/include/clang/Driver/DriverDiagnostic.h
/usr/lib/llvm-3.5/include/clang/Driver/Job.h
/usr/lib/llvm-3.5/include/clang/Driver/Multilib.h
/usr/lib/llvm-3.5/include/clang/Driver/Options.h
/usr/lib/llvm-3.5/include/clang/Driver/Options.inc
/usr/lib/llvm-3.5/include/clang/Driver/Phases.h
/usr/lib/llvm-3.5/include/clang/Driver/SanitizerArgs.h
/usr/lib/llvm-3.5/include/clang/Driver/Tool.h
/usr/lib/llvm-3.5/include/clang/Driver/ToolChain.h
/usr/lib/llvm-3.5/include/clang/Driver/Types.def
/usr/lib/llvm-3.5/include/clang/Driver/Types.h
/usr/lib/llvm-3.5/include/clang/Driver/Util.h