RFR: 8324679: Replace NULL with nullptr in HotSpot .ad files [v2]

[Vladimir Kozlov]

On Wed, 31 Jan 2024 20:22:13 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> This is a straightforward mechanical (sed) replacement of NULL with nullptr.  One string was adjusted to not say nullptr ptr.  nullptr makes sense in the comments so I didn't change them.
>> 
>> Tested with tier1 Oracle platforms and build test with linux-x64-zero,linux-x64-zero-debug,linux-s390x-open,linux-arm32-debug,linux-ppc64le-debug,linux-riscv64-debug
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix comments to Null Pointer and strings to null pointer.

Update looks good.

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Marked as reviewed by kvn (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17658#pullrequestreview-1854893114