update this unused code

src/codegen/profiling/oprofile.cpp

@@ -42,7 +42,7 @@ void OprofileJITEventListener::NotifyObjectEmitted(const llvm::ObjectImage& Obj)
     if (VERBOSITY() >= 1)
         printf("An object has been emitted:\n");
 
-    llvm::error_code code;
+    llvm_error_code code;
     for (llvm::object::symbol_iterator I = Obj.begin_symbols(), E = Obj.end_symbols(); I != E;) {
         llvm::object::SymbolRef::Type type;
         code = I->getType(type);