When cloning objects using spread and update properties (e.g.
obj = {...o, x: 0}), we wrongly used the setter for the update argument
if one was set.
This CL changes the behaviour such that all arguments following the
spread are treated as dynamic arguments.

Bug: chromium:1251366
Change-Id: I76a6d02606dca0faa0a256f465834d85d3df4f6f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3178969
Commit-Queue: Patrick Thier <pthier@chromium.org>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77079}