RFR: 8345647: Fix recent NULL usage backsliding in Shenandoah

[Kim Barrett]

On Tue, 10 Dec 2024 13:22:55 GMT, Julian Waters <jwaters at openjdk.org> wrote:

> Not really sure if just a comment change warrants a Pull Request, but since it is already done and is trivial why not

*Any* change requires a JBS issue and a PR.  Sometimes something simple like this can be folded into another change.

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PR Comment: https://git.openjdk.org/jdk/pull/22647#issuecomment-2536247617