message: inline initialize byte_width
diff: @@ -383,9 +383,10 @@ class Reference {
  type_(type) {}
  Reference(const uint8_t *data, uint8_t parent_width, uint8_t packed_type)
  - : data_(data), parent_width_(parent_width) {
  - byte_width_ = static_cast<BitWidth>(1U << (packed_type & 3));
  - type_ = static_cast<Type>(packed_type >> 2);
  + : data_(data),
  + parent_width_(parent_width),
  + byte_width_(1 << (packed_type & 3)),
  + type_(static_cast<Type>(packed_type >> 2)) {
  }
  Type GetType() const { return type_; }
  