RFR: 8351661: NMT: VMATree should support separate call-stacks for reserve and commit operations [v36]

[Afshin Zafari]

> In NMT detail mode, we need to have separate call-stacks for Reserve and Commit operations.
> This PR adds a second stack to every node that will be used when committing (and uncommitting) the start node of a reserved region.

Afshin Zafari has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 39 commits:

 - Merge remote-tracking branch 'origin/master' into _8351661_separate_call_stack_reserve_commit
 - invalid -> release.
 - old format comments are removed. Redundant tests are removed.
 - visualizations added. 1st try.
 - 'rd*' ->'rd_<Tag>_cs<n>'
 - Johan's comments.
 - some comments changed
 - fixed a missed change in test.
 - impl of new visualization in one test case, for getting feedback.
 - a merge glitch
 - ... and 29 more: https://git.openjdk.org/jdk/compare/3f0fef2c...cff9eeb4

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Changes: https://git.openjdk.org/jdk/pull/24028/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24028&range=35
  Stats: 2113 lines in 6 files changed: 1845 ins; 81 del; 187 mod
  Patch: https://git.openjdk.org/jdk/pull/24028.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24028/head:pull/24028

PR: https://git.openjdk.org/jdk/pull/24028