Don't call UpdateDescriptors twice on {map} in the cases where {map} is
not the initial map.

Change-Id: I2005b8dda1b15c87e0bf1d933a16a2aedfa7ac6b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2743888Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73372}