RFR: 8337418: Fix -Wzero-as-null-pointer-constant warnings in prims code

[Kim Barrett]

On Tue, 30 Jul 2024 07:54:43 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Please review this change that removes some uses of literal 0 as a null
>> pointer constant in prims code.
>> 
>> Testing: mach5 tier1
>
> Okay - looks good. Thanks.

Thanks for reviews @dholmes-ora , @shipilev , @TheShermanTanker , and @sspitsyn .

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PR Comment: https://git.openjdk.org/jdk/pull/20385#issuecomment-2260494132