Make Initialize functions name consistent for Intl.*

Bug: v8:5751
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: If4736007fc8f048a087469acc5d968e6ece289ce
Reviewed-on: https://chromium-review.googlesource.com/c/1261644Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56390}