Method null_bytes_offset

be/src/runtime/descriptors.h:637–637

  // constants during codegen.
  int IR_NO_INLINE num_null_bytes() const { return num_null_bytes_; }
  int IR_NO_INLINE null_bytes_offset() const { return null_bytes_offset_; }
  const std::vector<SlotDescriptor*>& slots() const { return slots_; }

  const std::vector<SlotDescriptor*>& string_slots() const {