This method has no users in this CL and is a pre-requisite for shared
strings.

Bug: v8:12007
Change-Id: Id8eaf58aa8bb3092c710279c0c9ae0eda5581284
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3321564Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78312}