RFR: JDK-8301068: Replace NULL with nullptr in share/jvmci/ [v2]

[Johan Sjölen]

On Wed, 25 Jan 2023 17:34:52 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   vnkozlov's fixes
>
> Few missed `nullptr` in messages.

Thanks @vnkozlov, I've fixed the issues you found!

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PR: https://git.openjdk.org/jdk/pull/12183