Generate count leading zeroes table

generate.js

function makeLeadingZeroTable() {
  let i = 0
  const table = new Uint8Array(256)
  while (i < 256) {
    let count = 8
    let index = i
    while (index > 0) {
      index = (index / 2) | 0
      count--
    }
    table[i] = count
    i++
  }
  return table
}