/usr/include/llvm-3.6/llvm/Target/ 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/Target/CostTable.h
/usr/include/llvm-3.6/llvm/Target/Target.td
/usr/include/llvm-3.6/llvm/Target/TargetCallingConv.h
/usr/include/llvm-3.6/llvm/Target/TargetCallingConv.td
/usr/include/llvm-3.6/llvm/Target/TargetFrameLowering.h
/usr/include/llvm-3.6/llvm/Target/TargetInstrInfo.h
/usr/include/llvm-3.6/llvm/Target/TargetIntrinsicInfo.h
/usr/include/llvm-3.6/llvm/Target/TargetItinerary.td
/usr/include/llvm-3.6/llvm/Target/TargetLibraryInfo.h
/usr/include/llvm-3.6/llvm/Target/TargetLowering.h
/usr/include/llvm-3.6/llvm/Target/TargetLoweringObjectFile.h
/usr/include/llvm-3.6/llvm/Target/TargetMachine.h
/usr/include/llvm-3.6/llvm/Target/TargetOpcodes.h
/usr/include/llvm-3.6/llvm/Target/TargetOptions.h
/usr/include/llvm-3.6/llvm/Target/TargetRegisterInfo.h
/usr/include/llvm-3.6/llvm/Target/TargetSchedule.td
/usr/include/llvm-3.6/llvm/Target/TargetSelectionDAG.td
/usr/include/llvm-3.6/llvm/Target/TargetSelectionDAGInfo.h
/usr/include/llvm-3.6/llvm/Target/TargetSubtargetInfo.h