This CL only refactors code in the sweeper without changing behavior.

This method can be simplified by moving duplicate code into new methods.
Also move definition of FreeRangesMap into TypedSlotSet and replace all
usages of that raw map type with that type-alias.

Since we are already here, remove the unused argument in
Sweeper::FreeAndProcessFreedMemory.

Bug: v8:12760
Change-Id: Ifa1848b456aef7955eccbaafc00df55fbcbc385c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3574542Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79822}