This adds the data structure and a builder for it, without ever using it
yet. Users and tests will be added in a follow-up CL.

R=mstarzinger@chromium.org

Bug: v8:10019
Change-Id: I5c332c8b3a499d3844113fbd4108a9138eef01f1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1932365
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65165}