RFR: JDK-8300242 : Replace NULL with nullptr in share/code/

[Johan Sjölen]

On Tue, 17 Jan 2023 11:16:44 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> Do the conversion in the share/code/ sub-directory and all of its files.

Thank you for the reviews, I will integrate when testing passes.

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PR: https://git.openjdk.org/jdk/pull/12031