Port 55643564 https://crrev.com/c/1714656

Original Commit Message:

    This removes a shortcut to a "CEntryStub" from the instance object and
    instead loads those values via the root set which is also referenced
    from the instance. It makes instance objects smaller.

Change-Id: I62d16960cb18e3cd69c2fa56da85a6bfc6064db4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1716473Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Yu Yin <xwafish@gmail.com>
Cr-Commit-Position: refs/heads/master@{#62907}