We may want to access their deopt checkpoint to create a tagged value
during merging.

Bug: v8:7700
Change-Id: I0f81e3ea5e871b775e1509044fa1d1f7bb70db4e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3706617
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81174}