This CL ensures that recorded slots are either in the sweeping or the
old-to-new remembered set after mark-compact depending on whether the
page was already swept or not.

All pages that are swept during the evacuation phase also have their
remembered sets merged. is_local() is renamed to
is_compaction_space() and non-virtual. The PagedSpace now not only
knows whether it is a compaction space or not but also for which
collection through the compaction_space_kind_ field. This allows
RefillFreeList to merge the remembered sets immediately also for the
mark-compact collection.

Change-Id: I7457f8393d73f3e8d6b6ebedc46ebc36af509729
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1868613Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64458}