RFR: 8337239: Fix simple -Wzero-as-null-pointer-constant warnings in classfile code

[Kim Barrett]

On Fri, 26 Jul 2024 02:44:54 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Please review this trivial change that replaces some uses of literal 0 as a
>> null pointer constant in classfile code to instead use nullptr.
>> 
>> Testing: mach5 tier1
>
> Looks good and trivial.
> 
> Thanks

Thanks for review @dholmes-ora

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PR Comment: https://git.openjdk.org/jdk/pull/20340#issuecomment-2251903399