Method LoadFullWord

cpp/src/arrow/util/bitmap_reader.h:126–131

 private:
  uint64_t LoadFullWord() {
    uint64_t word;
    memcpy(&word, bitmap_, 8);
    bitmap_ += 8;
    return bit_util::ToLittleEndian(word);
  }

  uint64_t LoadPartialWord(int8_t bit_offset, int64_t num_bits) {
    uint64_t word = 0;