/usr/lib/llvm-3.8/include/lldb/Expression/ is in liblldb-3.8-dev 1:3.8-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/llvm-3.8/include/lldb/Expression/DWARFExpression.h
/usr/lib/llvm-3.8/include/lldb/Expression/Expression.h
/usr/lib/llvm-3.8/include/lldb/Expression/ExpressionParser.h
/usr/lib/llvm-3.8/include/lldb/Expression/ExpressionSourceCode.h
/usr/lib/llvm-3.8/include/lldb/Expression/ExpressionTypeSystemHelper.h
/usr/lib/llvm-3.8/include/lldb/Expression/ExpressionVariable.h
/usr/lib/llvm-3.8/include/lldb/Expression/FunctionCaller.h
/usr/lib/llvm-3.8/include/lldb/Expression/IRDynamicChecks.h
/usr/lib/llvm-3.8/include/lldb/Expression/IRExecutionUnit.h
/usr/lib/llvm-3.8/include/lldb/Expression/IRInterpreter.h
/usr/lib/llvm-3.8/include/lldb/Expression/IRMemoryMap.h
/usr/lib/llvm-3.8/include/lldb/Expression/LLVMUserExpression.h
/usr/lib/llvm-3.8/include/lldb/Expression/Materializer.h
/usr/lib/llvm-3.8/include/lldb/Expression/REPL.h
/usr/lib/llvm-3.8/include/lldb/Expression/UserExpression.h
/usr/lib/llvm-3.8/include/lldb/Expression/UtilityFunction.h