RFR: 8343800: Cleanup definition of NULL_WORD

[Kim Barrett]

On Mon, 2 Dec 2024 11:59:51 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Please review this change to how NULL_WORD is defined.  Instead of being a
>> macro whose definition is in compiler-specific files with a conditionally
>> defined expansion, it is now a simple integral constant with a single shared
>> definition.
>> 
>> Testing: mach5 tier 1-5, GHA sanity tests.
>
> Marked as reviewed by dholmes (Reviewer).

Thanks for reviews @dholmes-ora and @vnkozlov

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PR Comment: https://git.openjdk.org/jdk/pull/22468#issuecomment-2513550321