... which will update both the CodeObjectSlot contents and the cached
value of the code entry point when the pointed Code object is
evacuated.
This is done by introducing an OLD_TO_CODE remembered set which is
populated with the recorded slots containing pointers to Code objects.
CodeDataContainer is the only kind of holder that can contain Code
pointers, so having a CodeObjectSlot is enough to compute the holder
CodeDataContainer object and update the cached code entry point there.

This CL fixes the data race in the previous implementation which were
updating the code entry point during Code object migration.

Bug: v8:11880
Change-Id: I44aa46af4bad7eb4eaa922b6876d5f2f836e0791
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3035084
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75826}