RFR: 8328944: NMT reports "unknown" memory

[Gerard Ziemski]

On Fri, 1 Nov 2024 20:44:50 GMT, Gerard Ziemski <gziemski at openjdk.org> wrote:

> We use `mtNone` value in several functions default parameters, which may show up in NMT reports.
> 
> We address this, by avoiding using `mtNone`.
> 
> Eventually the goal would be to eliminate using `mtNone` whenever possible.
> TODO: update copyrights.
> 
> Testing: undergoing MARCH5 tier1-5 ...

I re-did this fix from scratch, making sure that we do not loose Thomas'es expert knowledge, which he shared in his feedback.

This fix focuses on fixing the cases in the issue.

The more general approach to limit `mtNone` usage is left for a followup.

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PR Comment: https://git.openjdk.org/jdk/pull/21843#issuecomment-2486834505