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

[David Holmes]

On Mon, 29 Jan 2024 13:51:50 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> ie, we should file a separate RFE for comments.
>
> And in this comment nullptr makes perfect sense.

Yeah I wasn't commenting on the use of nullptr in the comment :)

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PR Review Comment: https://git.openjdk.org/jdk/pull/17577#discussion_r1470686744