RFR: 8324678: Replace NULL with nullptr in HotSpot gtests [v2]

[Kim Barrett]

On Mon, 29 Jan 2024 05:16:12 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Part of the cleanup with using `nullptr` is that we should never need to cast `nullptr` to another pointer type. I flagged a few cases below but certainly not all.

I think this may eventually be true, but I don't think it is currently true.  I think we will need to add overloads for
std::nullptr_t in some places in order to remove some casts.  This is particularly true for templates, and I think all
of the places you mentioned are of this kind.

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PR Comment: https://git.openjdk.org/jdk/pull/17577#issuecomment-1914626715