... as a prerequisite for adding InstructionStream heap object.

Bug: v8:11880
Change-Id: I22b4832cedd46bee4a4c5a0d7b5032eba10b2a7b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3310900Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78204}