In noembed builds we serialize all builtins as full on-heap code
objects.

Bug: v8:8716
Cq-Include-Trybots: luci.v8.try:v8_linux_noembed_rel_ng
Change-Id: I48f25a12e05a6d8599e5f9c31f9f56f2ebb9f2d6
Reviewed-on: https://chromium-review.googlesource.com/c/1448272Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59244}