This is to implement a new change in the proposal
'14.  If style is "narrow" and type is not "unit", throw a RangeError exception.'
in #sec-Intl.ListFormat
See also
https://github.com/tc39/proposal-intl-list-format/issues/16
https://github.com/tc39/proposal-intl-list-format/pull/27
and
https://github.com/tc39/test262/pull/1860

Bug: v8:8302
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: I0a3dc99eeb18082f359c24c472889d8b6e905225
Reviewed-on: https://chromium-review.googlesource.com/c/1277660
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Frank Tang <ftang@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Daniel Ehrenberg <littledan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56707}