BaseSpace classes. So BaseSpace should have a virtual destructor
for memory to be freed properly.

cppgc: :internal::RawHeap maintains a std::vector of
std: :unique_ptr<BaseSpace> and stores there different derived from
Change-Id: Id9f59817799303bf62aafb66b3a29770bbd2af1f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3379228Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Alexey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78558}