Prepare for pointer compression changes

Change-Id: I8ec56ac65194f1f89f2803af155d5bec520a569f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2171036
Auto-Submit: Junliang Yan <jyan@ca.ibm.com>
Reviewed-by: Milad Farazmand <miladfar@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#67455}