... when they are enabled via the GN flag.

Also disable this optimizaion for CFI builds for now.

Sheriffs: This CL adds ~1.2-1.4Mb of memory overhead per Isolate on
certain configurations and that's expected. This is a temporary fix
until the full solution is implemented.
See the design doc linked to the issue for details.

Bug: v8:11527
Change-Id: I7444c6878ea58d67ef580cf50cb550b3820c85c4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2784690
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73650}