RFR: 8338154: Fix -Wzero-as-null-pointer-constant warnings in gtest framework

[Kim Barrett]

On Mon, 12 Aug 2024 20:38:43 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Please review this change to remove -Wzero-as-null-pointer-constant warnings
>> produced by the gtest framework when such warnings are enabled.
>> 
>> Warnings from the 3rd party GoogleTest are suppressed by disabling that
>> warning when compiling those files.
>> 
>> Testing: mach5 tier1
>
> Build change is trivially fine.

Thanks for reviews @magicus , @TheShermanTanker , and @dholmes-ora

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PR Comment: https://git.openjdk.org/jdk/pull/20536#issuecomment-2285382903