message: Insert new line to separate preprocessor directive
  Otherwise it seems clang-format recognizes this as a multi-line
  preprocessor directive, strange, but preventable.
diff: @@ -237,6 +237,7 @@ namespace gpos
  #ifdef GPOS_DEBUG
  BOOL recycled =
  #endif // GPOS_DEBUG
  +
  // unset the reserve bit - must succeed
  UnsetBit(&m_objs_reserved[elem_offset], bit_val);
  