RFR: 8328944: NMT reports "unknown" memory [v2]

[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`.
> 
> Eventually the goal would be to eliminate using `mtNone` whenever possible.
> TODO: update copyrights.
> 
> Testing: undergoing MARCH5 tier1-5 ...

Gerard Ziemski has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - avoid using mtNone
 - Merge remote-tracking branch 'upstream/master' into JDK-8328944
 - revert, we will re-do with a smaller change
 - remove more mtNone
 - remove API that allows to change the mem_tag for virtual memory, feedback
 - do not allow default parameter for mtNone

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/21843/files
  - new: https://git.openjdk.org/jdk/pull/21843/files/483e08c2..33dbafdc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21843&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21843&range=00-01

  Stats: 317732 lines in 4373 files changed: 167679 ins; 118575 del; 31478 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