... an ObjectVisitor subclass that takes care of caching values of
both the main pointer compression cage base and code cage base
(when the external code space is enabled).

Drive-by: this CL also changes signature of
RelocInfo::target_object_no_host(...) to accept PtrComprCageBase
instead of Isolate*.

Bug: v8:11880
Change-Id: I3fbb382e0a0170e28542bc495d8fecfd24da8a07
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3182231
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77088}