RFR: 8324678: Replace NULL with nullptr in HotSpot gtests [v2]

[Coleen Phillimore]

On Mon, 29 Jan 2024 13:48:12 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Like I said in the description, we can change the comments on a case-by-case basis in order to get the bulk of the change done mechanically.
>
> ie, we should file a separate RFE for comments.

And in this comment nullptr makes perfect sense.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17577#discussion_r1469623710