RFR: JDK-8300243: Replace NULL with nullptr in share/compiler/

[Tobias Hartmann]

On Tue, 17 Jan 2023 11:20:28 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

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

Looks good to me.

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Marked as reviewed by thartmann (Reviewer).

PR: https://git.openjdk.org/jdk/pull/12032