RFR: 8345050: Fix -Wzero-as-null-pointer warning in MemPointer ctor

[Kim Barrett]

On Tue, 26 Nov 2024 11:09:46 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>> Please review this trivial change to use nullptr instead of a literal 0 in a
>> call to Node::dump_bfs by the MemPointer ctor.
>> 
>> Testing: mach5 tier1
>
> Looks good and trivial.

Thanks for reviews @chhagedorn and @shipilev .

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PR Comment: https://git.openjdk.org/jdk/pull/22388#issuecomment-2503029376