Update expected results for day period to match CLDR 47

[anba]

Also see unicode-org/cldr#4375.

[gibson042]

I'm approving this as-is, but would really love to see the tests made less brittle, e.g.

var inputs = [];
for (var h = 0; h < 24; h++) {
  inputs.push(new Date(2017, 11, 12,  h, 0, 0, 0));
}
assert.sameValue(inputs.length, 24);

// Each expected dayPeriod value must be a) contiguous, and
// b) represented in sequence.
var expectedDayPeriods = [
  'in the morning',
  'noon',
  'in the afternoon',
  'in the evening',
  'at night'
];

var long = new Intl.DateTimeFormat('en', {
  dayPeriod: 'long'
});
var longNumeric = new Intl.DateTimeFormat('en', {
  dayPeriod: 'long',
  hour: 'numeric'
});
var counts = expectedDayPeriods.map(function() { return 0; });
var transitionTargets = [];
var firstDayPeriod, prevDayPeriod;
for (var h = 0; h < 24; h++) {
  var dayPeriod = long.format(inputs[h]);
  var i = expectedDayPeriods.indexOf(dayPeriod);
  assert(i >= 0, 'dayPeriod must be expected: ' + dayPeriod);
  if (h === 0) {
    firstDayPeriod = dayPeriod;
    transitionTargets.push(dayPeriod);
  } else if (dayPeriod !== prevDayPeriod) {
    transitionTargets.push(dayPeriod);
    var oldCount = counts[i];
    // The first value might span the beginning and end of a day's hours.
    if (dayPeriod !== firstDayPeriod) {
      assert.sameValue(oldCount, 0,
        'dayPeriod must be contiguous: ' + dayPeriod);
    }
  }

  assert.sameValue(
    longNumeric.format(inputs[h]),
    // Hour "00" is represented as "12".
    ((h % 12) || 12) + ' ' + dayPeriod,
    'numeric hour must precede dayPeriod');

  counts[i]++;
  prevDayPeriod = dayPeriod;
}
if (transitionTargets.length > 1) {
  if (transitionTargets[transitionTargets.length - 1] === transitionTargets[0]) {
    transitionTargets.pop();
  }
  // Rotate the first expected dayPeriod into initial position.
  var i = transitionTargets.indexOf(expectedDayPeriods[0]);
  if (i > 0) {
    var values = transitionTargets.splice(0, i);
    transitionTargets = transitionTargets.concat(values);
  }
}
assert.compareArray(transitionTargets, expectedDayPeriods,
  'dayPeriods must appear in the right sequence');

[ptomato]

@gibson042 If you don't mind, I'll take your suggestion and make it into a different PR that could supersede this one, since you've already done the hard part.

[ptomato]

See #4447