Mirroring Code::entry and CodeDataContainer::code_entry_point.
Unused for now; will be used very soon.

Change-Id: I93b86f0c601a044bb4e6afea642d5d3f721ef73a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3205893Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Auto-Submit: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77249}