RFR: JDK-8300245: Replace NULL with nullptr in share/jfr/ [v3]

[Johan Sjölen]

On Tue, 24 Jan 2023 20:58:27 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> Do the conversion in the share/jfr/ sub-directory and all of its files.
>
> Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Manual fix

Found one file which now has no changes so copyright should be reverted.

Went another round through and submitting for testing (tier1)

src/hotspot/share/jfr/utilities/jfrAllocation.hpp line 2:

> 1: /*
> 2:  * Copyright (c) 2014, 2023, Oracle and/or its affiliates. All rights reserved.

Unchanged file, fix

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PR: https://git.openjdk.org/jdk/pull/12034