RFR: 8339346: GenShen: Remove even more stale TODOs

Wed Sep 4 00:28:41 UTC 2024

On Fri, 30 Aug 2024 21:22:59 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Some of these have been done, some of these will not be done, some have been moved into our ticketing system, some of them are done in this PR.

The `const` is confusing because it doesn't make `oop` const.

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PR Comment: https://git.openjdk.org/shenandoah/pull/491#issuecomment-2327679108