Type is usually not used by Intl.v8BreakIterator unless
resolvedOptions() is called. Therefore we can save memory by
removing it from the object and using a slow test from the
iterator to find out the type when needed.

Bug: v8:10252
Change-Id: I7a8dfdc8310eab0d1c90278fbadfbae48e49668e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2067694
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66392}