RFR: 8351661: NMT: VMATree should support separate call-stacks for reserve and commit operations [v27]

[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 30 commits:

 - a merge glitch
 - Merge remote-tracking branch 'origin/master' into _8351661_separate_call_stack_reserve_commit
 - Gerard's patch.
 - Merge remote-tracking branch 'origin/master' into _8351661_separate_call_stack_reserve_commit
 - fixed one case.
 - test with random requests passes now.
 - semantic text added.
 - more tests for full coverage of update_region.
 - fixes for cross-compilations
 - removed print_on for release build success.
 - ... and 20 more: https://git.openjdk.org/jdk/compare/b8d2bdb4...276c545f

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Changes: https://git.openjdk.org/jdk/pull/24028/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24028&range=26
  Stats: 2926 lines in 5 files changed: 2709 ins; 81 del; 136 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