/usr/include/llvm-3.5/llvm/IR/ is in llvm-3.5-dev 1:3.5~svn201651-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/llvm-3.5/llvm/IR/Argument.h
/usr/include/llvm-3.5/llvm/IR/AssemblyAnnotationWriter.h
/usr/include/llvm-3.5/llvm/IR/Attributes.h
/usr/include/llvm-3.5/llvm/IR/BasicBlock.h
/usr/include/llvm-3.5/llvm/IR/CallingConv.h
/usr/include/llvm-3.5/llvm/IR/Constant.h
/usr/include/llvm-3.5/llvm/IR/Constants.h
/usr/include/llvm-3.5/llvm/IR/DataLayout.h
/usr/include/llvm-3.5/llvm/IR/DerivedTypes.h
/usr/include/llvm-3.5/llvm/IR/DiagnosticInfo.h
/usr/include/llvm-3.5/llvm/IR/DiagnosticPrinter.h
/usr/include/llvm-3.5/llvm/IR/Dominators.h
/usr/include/llvm-3.5/llvm/IR/Function.h
/usr/include/llvm-3.5/llvm/IR/GlobalAlias.h
/usr/include/llvm-3.5/llvm/IR/GlobalValue.h
/usr/include/llvm-3.5/llvm/IR/GlobalVariable.h
/usr/include/llvm-3.5/llvm/IR/IRBuilder.h
/usr/include/llvm-3.5/llvm/IR/IRPrintingPasses.h
/usr/include/llvm-3.5/llvm/IR/InlineAsm.h
/usr/include/llvm-3.5/llvm/IR/InstrTypes.h
/usr/include/llvm-3.5/llvm/IR/Instruction.def
/usr/include/llvm-3.5/llvm/IR/Instruction.h
/usr/include/llvm-3.5/llvm/IR/Instructions.h
/usr/include/llvm-3.5/llvm/IR/IntrinsicInst.h
/usr/include/llvm-3.5/llvm/IR/Intrinsics.gen
/usr/include/llvm-3.5/llvm/IR/Intrinsics.h
/usr/include/llvm-3.5/llvm/IR/Intrinsics.td
/usr/include/llvm-3.5/llvm/IR/IntrinsicsAArch64.td
/usr/include/llvm-3.5/llvm/IR/IntrinsicsARM.td
/usr/include/llvm-3.5/llvm/IR/IntrinsicsHexagon.td
/usr/include/llvm-3.5/llvm/IR/IntrinsicsMips.td
/usr/include/llvm-3.5/llvm/IR/IntrinsicsNVVM.td
/usr/include/llvm-3.5/llvm/IR/IntrinsicsPowerPC.td
/usr/include/llvm-3.5/llvm/IR/IntrinsicsR600.td
/usr/include/llvm-3.5/llvm/IR/IntrinsicsX86.td
/usr/include/llvm-3.5/llvm/IR/IntrinsicsXCore.td
/usr/include/llvm-3.5/llvm/IR/LLVMContext.h
/usr/include/llvm-3.5/llvm/IR/LegacyPassManager.h
/usr/include/llvm-3.5/llvm/IR/LegacyPassManagers.h
/usr/include/llvm-3.5/llvm/IR/MDBuilder.h
/usr/include/llvm-3.5/llvm/IR/Mangler.h
/usr/include/llvm-3.5/llvm/IR/Metadata.h
/usr/include/llvm-3.5/llvm/IR/Module.h
/usr/include/llvm-3.5/llvm/IR/OperandTraits.h
/usr/include/llvm-3.5/llvm/IR/Operator.h
/usr/include/llvm-3.5/llvm/IR/PassManager.h
/usr/include/llvm-3.5/llvm/IR/SymbolTableListTraits.h
/usr/include/llvm-3.5/llvm/IR/Type.h
/usr/include/llvm-3.5/llvm/IR/TypeBuilder.h
/usr/include/llvm-3.5/llvm/IR/TypeFinder.h
/usr/include/llvm-3.5/llvm/IR/Use.h
/usr/include/llvm-3.5/llvm/IR/User.h
/usr/include/llvm-3.5/llvm/IR/Value.h
/usr/include/llvm-3.5/llvm/IR/ValueSymbolTable.h
/usr/include/llvm-3.5/llvm/IR/Verifier.h
/usr/include/llvm-3.5/llvm/IRReader/IRReader.h