Function RoundUp

cpp/src/arrow/util/bit_util.h:88–90

Returns 'value' rounded up to the nearest multiple of 'factor'

// Returns 'value' rounded up to the nearest multiple of 'factor'
constexpr int64_t RoundUp(int64_t value, int64_t factor) {
  return CeilDiv(value, factor) * factor;
}

// Returns 'value' rounded down to the nearest multiple of 'factor'
constexpr int64_t RoundDown(int64_t value, int64_t factor) {