RFR: 8299973: Replace NULL with nullptr in share/utilities/ [v4]

[Johan Sjölen]

On Thu, 19 Jan 2023 10:28:18 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> Do the conversion in the share/utilities sub-directory and all of its files.
>
> Johan Sjölen has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Remove redundant assert
>  - Use "null" as generic term in logs and comments

I'd appreciate a new thumbs up for this PR as I made quite a few changes.

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PR: https://git.openjdk.org/jdk/pull/12015