/usr/include/llvm-3.6/llvm/DebugInfo/ is in llvm-3.6-dev 1:3.6-2ubuntu1~trusty2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/llvm-3.6/llvm/DebugInfo/DIContext.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFAbbreviationDeclaration.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFAcceleratorTable.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFCompileUnit.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFContext.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFDebugAbbrev.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFDebugArangeSet.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFDebugAranges.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFDebugFrame.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFDebugInfoEntry.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFDebugLine.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFDebugLoc.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFDebugRangeList.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFFormValue.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFRelocMap.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFSection.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFTypeUnit.h
/usr/include/llvm-3.6/llvm/DebugInfo/DWARFUnit.h