[jdk21u] RFR: 8293114: JVM should trim the native heap

[Aleksey Shipilev]

Clean backport to get the important feature to LTS users.

Additional testing:
 - [ ] Linux AArch64 fastdebug trimming tests
 - [ ] Linux AArch64 fastdebug `tier1`
 - [ ] Linux AArch64 fastdebug `tier2`
 - [ ] Linux AArch64 fastdebug `tier3`

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Commit messages:
 - Backport 9e4fc568a6f1a93c84a84d6cc5220c6eb4e546a5

Changes: https://git.openjdk.org/jdk21u/pull/13/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=13&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293114
  Stats: 843 lines in 20 files changed: 835 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk21u/pull/13.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/13/head:pull/13

PR: https://git.openjdk.org/jdk21u/pull/13