RFR: 8327171: Fix more NULL usage backsliding

[Kim Barrett]

On Sun, 3 Mar 2024 22:59:13 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Good and trivial. Thanks for fixing.

Thanks for the reviews, @lgxbslgx , @TheShermanTanker , and @dholmes-ora .

> Did we not establish if there was a way to poison NULL so this backsliding can't happen?

Someone, I think @TheShermanTanker , suggested some mechanism in the discussion of another PR (which I can't
find right now), but I think we concluded that it wouldn't work.  I don't think anything else has been suggested.

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PR Comment: https://git.openjdk.org/jdk/pull/18096#issuecomment-1975943882