/usr/lib/llvm-3.5/include/lldb/Host/ is in lldb-3.5-dev 1:3.5~svn201651-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/llvm-3.5/include/lldb/Host/Condition.h
/usr/lib/llvm-3.5/include/lldb/Host/Config.h
/usr/lib/llvm-3.5/include/lldb/Host/Debug.h
/usr/lib/llvm-3.5/include/lldb/Host/DynamicLibrary.h
/usr/lib/llvm-3.5/include/lldb/Host/Editline.h
/usr/lib/llvm-3.5/include/lldb/Host/Endian.h
/usr/lib/llvm-3.5/include/lldb/Host/File.h
/usr/lib/llvm-3.5/include/lldb/Host/FileSpec.h
/usr/lib/llvm-3.5/include/lldb/Host/Host.h
/usr/lib/llvm-3.5/include/lldb/Host/HostGetOpt.h
/usr/lib/llvm-3.5/include/lldb/Host/Mutex.h
/usr/lib/llvm-3.5/include/lldb/Host/OptionParser.h
/usr/lib/llvm-3.5/include/lldb/Host/Predicate.h
/usr/lib/llvm-3.5/include/lldb/Host/ProcessRunLock.h
/usr/lib/llvm-3.5/include/lldb/Host/SocketAddress.h
/usr/lib/llvm-3.5/include/lldb/Host/Symbols.h
/usr/lib/llvm-3.5/include/lldb/Host/Terminal.h
/usr/lib/llvm-3.5/include/lldb/Host/TimeValue.h
/usr/lib/llvm-3.5/include/lldb/Host/freebsd/
/usr/lib/llvm-3.5/include/lldb/Host/freebsd/Config.h
/usr/lib/llvm-3.5/include/lldb/Host/linux/
/usr/lib/llvm-3.5/include/lldb/Host/linux/Config.h
/usr/lib/llvm-3.5/include/lldb/Host/macosx/
/usr/lib/llvm-3.5/include/lldb/Host/macosx/Config.h
/usr/lib/llvm-3.5/include/lldb/Host/mingw/
/usr/lib/llvm-3.5/include/lldb/Host/mingw/Config.h
/usr/lib/llvm-3.5/include/lldb/Host/msvc/
/usr/lib/llvm-3.5/include/lldb/Host/msvc/Config.h
/usr/lib/llvm-3.5/include/lldb/Host/windows/
/usr/lib/llvm-3.5/include/lldb/Host/windows/GetOptInc.h
/usr/lib/llvm-3.5/include/lldb/Host/windows/editlinewin.h
/usr/lib/llvm-3.5/include/lldb/Host/windows/win32.h
/usr/lib/llvm-3.5/include/lldb/Host/windows/windows.h