RFR: JDK-8300245: Replace NULL with nullptr in share/jfr/ [v8]

[Markus Grönlund]

On Mon, 8 May 2023 11:01:56 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Dead assert
>
> Passes tier1.

Thanks @jdksjolen , I am rubberstamping this.

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PR Comment: https://git.openjdk.org/jdk/pull/12034#issuecomment-1538260329