RFR: 8324678: Replace NULL with nullptr in HotSpot gtests [v3]

[Coleen Phillimore]

On Mon, 29 Jan 2024 14:02:50 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 two additional commits since the last revision:
> 
>  - Removed some casts unneeded by nullptr change, and fixed one comment
>  - Removed some casts unneeded by nullptr change, and fixed one comment

Thanks also for reviewing, Julian.

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PR Comment: https://git.openjdk.org/jdk/pull/17577#issuecomment-1915193394