async function warmUpIntlSegmenter(driver) {
  await driver.executionContext.evaluate(pageFunctions.truncate, {
    args: ['aaa', 2],
  });
}
Ensure the `Intl.Segmenter` created in `pageFunctions.truncate` is cached by v8 before
recording the trace begins.

@param {LH.Gatherer.Driver} driver