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

[Coleen Phillimore]

On Mon, 29 Jan 2024 04:58:25 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> 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.
>
> test/hotspot/gtest/metaspace/metaspaceGtestCommon.hpp line 148:
> 
>> 146: 
>> 147: //////////////////////////////////////////////////////////
>> 148: // Some helpers to avoid typing out those annoying casts for nullptr
> 
> Casts for nullptr should no longer be needed

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.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17577#discussion_r1469614981