RFR: 8312132: Add tracking of multiple address spaces in NMT [v74]

[Johan Sjölen]

On Thu, 9 May 2024 11:35:29 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> And I would not rely on the internal verification here, but call verify explicitly. (see also note in treap add/remove about verification)
>
> Please also test the scoped find function with different sets (eg. empty set, 1 item set etc).

I've added a fair amount of tests to this code now. I still need to add some more for iterators, at least the closest_leq. Most of the tests use `int` (so not `size_t`), I wrote the `find` tests using `float` instead.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18289#discussion_r1600281887