RFR: 8312132: Add tracking of multiple address spaces in NMT [v46]

[Thomas Stuefe]

On Mon, 29 Apr 2024 08:51:26 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> How about making your own index type? Something that clearly distinguishes it from sizes. Can be a simple typedef.
>> 
>> I think address would be wrong. But size_t is also feeling off. I know we use size_t in other places as index or offset, but it still throws me off, I think of size_t as a size, not an offset.
>
> I'm fine with `typedef`:ing `size_t`, but I'd like a naming suggestion from you if that's alright. Naming isn't my strong suit and I'd prefer only doing the rename once :).

If the type is defined within VMATree scope, it can be anything short and succinct, e.g. 
`VMATree::position_t`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18289#discussion_r1584188364