RFR: 8312132: Add tracking of multiple address spaces in NMT [v2]

[Johan Sjölen]

On Wed, 20 Mar 2024 15:46:32 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Include the mutex header
>
> Nice! I went over the ZGC files and requested a few style updates.

@stefank, thank you for the style change suggestions. They've now been applied.

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PR Comment: https://git.openjdk.org/jdk/pull/18289#issuecomment-2020175830