RFR: 8328944: NMT reports "unknown" memory [v4]

[Gerard Ziemski]

> We use `mtNone` value in several functions default parameters, which may show up in NMT reports.
> 
> We address this, by avoiding using `mtNone`.
> 
> This fix only addresses the cases covered by the issue. I am not trying to replace every single `mtNone` here, but eventually the goal would be to do just that.
> 
> TODO: update copyrights.
> 
> Testing: undergoing MARCH5 tier1-5 ...

Gerard Ziemski has updated the pull request incrementally with one additional commit since the last revision:

  Stefan's feedback

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21843/files
  - new: https://git.openjdk.org/jdk/pull/21843/files/62a98865..42793a9a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21843&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21843&range=02-03

  Stats: 16 lines in 7 files changed: 0 ins; 0 del; 16 mod
  Patch: https://git.openjdk.org/jdk/pull/21843.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21843/head:pull/21843

PR: https://git.openjdk.org/jdk/pull/21843