RFR: 8324679: Replace NULL with nullptr in HotSpot .ad files

[Andrew Haley]

On Wed, 31 Jan 2024 20:18:46 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> Thanks for looking at this Vladimir. I made these changes. I don't know about this aarch64_ad.m4. It didn't have any NULL in it so not sure how it would be used to generate aarch64.ad. We can wait for Andrew to answer.

It's done manually. Just `m4 aarch64_ad.m4` then paste the result between 


// BEGIN This section of the file is automatically generated. Do not edit --------------
// This section is generated from aarch64_ad.m4


and

`// END This section of the file is automatically generated. Do not edit --------------
`

Yea, that's a bit clunky, but it's a helluva lot more maintainable (and reliable!) than copy-and-pasting all of that boilerplate by hand.

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PR Comment: https://git.openjdk.org/jdk/pull/17658#issuecomment-1920969778