RFR: 8312132: Add tracking of multiple address spaces in NMT [v97]

[Gerard Ziemski]

On Thu, 23 May 2024 12:37:07 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> I really prefer `upsert` over `insert`, the point is to show that it works for both *up*dating and in*sert*ing! It is pretty well established in database terminology. I can go with `add` if you're not comfortable with `upsert`.
>
> +1 for upsert. Its an established term.

If `upsert` is part of the tree vocabulary, then I'm OK with that.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18289#discussion_r1611844342