When the serializer encounters a JSConstruct, it now serializes the
initial map of the new_target to enable further opitmizations in
JSNativeContextSpecialization.

Add regression tests as well.

Bug: v8:7790
Change-Id: Ifab2b58c64a341744e833ed063e9695d74a5cdce
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1900457
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64886}