There was an issue in the register allocation in the original CL. The
register of the new_value did not get pinned, so it was used for the
expected value as well.

Bug: v8:10108
Change-Id: I2589fc31f8fbfda39c94ea5801f63ed370a3b7ce
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2084815
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66579}