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

[Julian Waters]

On Fri, 26 Jan 2024 21:28:01 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> If this is sufficient, here's the change for NULL to nullptr, adjusting some obvious strings that had NULL in them maybe not all.
>> Tested with gtest,
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix nullptr in comments and strings to null.  @kimbarrett changes.

Marked as reviewed by jwaters (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/17577#pullrequestreview-1848398138