RFR: 8339346: GenShen: Remove even more stale TODOs

Wed Sep 4 00:12:39 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.

Marked as reviewed by kdnilsen (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/491#pullrequestreview-2278706623