RFR: 8335294: Fix simple -Wzero-as-null-pointer-constant warnings in gc code

[Kim Barrett]

On Fri, 28 Jun 2024 12:40:22 GMT, Julian Waters <jwaters at openjdk.org> wrote:

> Looks good. Does -Wzero-as-null-constant prevent any new NULL from creeping in also?

Thanks.  As mentioned in the umbrella bug (https://bugs.openjdk.org/browse/JDK-8332189), enabling that warning
doesn't help with backsliding on NULL usage.  I've not (yet) found a way to do that.

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PR Comment: https://git.openjdk.org/jdk/pull/19934#issuecomment-2197749060