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

[Johan Sjölen]

On Tue, 30 Apr 2024 17:32:46 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> If the class is general enough, then perhaps it should be moved into `shared/utilities` so others can use it as well? A candidate for a follow up later?
>
> Yea, at least long term. For me its fine in another RFE too, or if we see a second use for this class. (One possibility I mentioned to StefanK recently was using this class to track zgc memory pages, which is currently done with linked lists).
> 
> Up to you, @jdksjolen

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.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18289#discussion_r1587709727