Pointer compression regresses binary size on Fuchsia by about 300K.
However, the change improves Oilpan memory by 15-20% (2-4% of PMF),
which is beneficial for memory-impoverished platforms.

Bug: chromium:1325007
Fuchsia-Binary-Size: See commit description.
Change-Id: Ie16fd992e45e29e264549a960e9755ec58da1691
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3829313Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82572}