RFR: 8343802: Prevent NULL usage backsliding [v6]

[Kim Barrett]

On Mon, 10 Feb 2025 20:59:32 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> I realized that my proposal is much stronger than the script, as it also forbids any 3rd headers included by hotspot from using NULL. If that's not our intention, then I withdraw my proposal.

Yes, that is the problem with such an approach.  Consider, for example, the Google Test framework.
I have no idea whether it uses NULL, nullptr, or a mix, and don't want to care.

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PR Comment: https://git.openjdk.org/jdk/pull/23466#issuecomment-2649780192