RFR: 8337217: Port VirtualMemoryTracker to use VMATree [v35]

[Afshin Zafari]

> - `VMATree` is used instead of `SortedLinkList` in new class `VirtualMemoryTracker`.
>  -  A wrapper/helper `RegionTree` is made around VMATree to make some calls easier.
>  - `find_reserved_region()` is used in 4 cases, it will be removed in further PRs.
>  - All tier1 tests pass except this https://bugs.openjdk.org/browse/JDK-8335167.

Afshin Zafari has updated the pull request incrementally with one additional commit since the last revision:

  review comments applied

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20425/files
  - new: https://git.openjdk.org/jdk/pull/20425/files/fc106d5f..f2f1a800

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20425&range=34
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20425&range=33-34

  Stats: 6 lines in 4 files changed: 1 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/20425.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20425/head:pull/20425

PR: https://git.openjdk.org/jdk/pull/20425