RFR: 8312132: Add tracking of multiple address spaces in NMT [v54]

[Thomas Stuefe]

On Thu, 2 May 2024 14:16:03 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> We're leaving it as `VMATree`, it's a private name for us NMT developers and we've all seen it and talked about it at this point.
>
> And to clarify: If this gets moved to utilities, then of course the name can be changed. It'd require a lot of other stuff to change also, probably.

Can live with that.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18289#discussion_r1587744751