They were disabled when enabling pointer compression due to a bug (See
v8:9568), and they were never re-enabled.

Fixes: v8:9568
Bug: v8:9568, v8:7703
Change-Id: I3918ec57726ab9a7f943ab8506636cc95c376c20
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2007496
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Auto-Submit: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65853}