RFR: 8339870: Remove yet more stale TODOs

[William Kemper]

Final round of TODO removal.

## Testing

GHA, Internal pipelines

-------------

Commit messages:
 - Make verify more strict
 - Make generation's inclusion test stricter
 - Remove more TODOs (moved into ticketing)
 - Use table scanner abstraction for remset verification closure
 - Merge remote-tracking branch 'shenandoah/master' into fix-yet-more-stale-todos
 - Remove TODOs, consolidate remset verification for regions
 - Remove TODOs, fix typo in closure name
 - Remove TODOs, put pointer's asterisk next to type
 - Remove TODOs
 - oop arguments do not need to be const
 - ... and 11 more: https://git.openjdk.org/shenandoah/compare/662d146d...8719ba9d

Changes: https://git.openjdk.org/shenandoah/pull/496/files
  Webrev: https://webrevs.openjdk.org/?repo=shenandoah&pr=496&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339870
  Stats: 265 lines in 10 files changed: 48 ins; 132 del; 85 mod
  Patch: https://git.openjdk.org/shenandoah/pull/496.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/496/head:pull/496

PR: https://git.openjdk.org/shenandoah/pull/496