In particular, some methods were public even though they should have
been protected/private (FreeListCategoryType), and some other methods
were declared but not defined (SearchForNodeInList).

Bug: v8:9329
Change-Id: I7a1e97c82395c5907b750d89057b37b64bc0c253
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1704096Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Darius Mercadier <dmercadier@google.com>
Cr-Commit-Position: refs/heads/master@{#62745}