[jdk21u] RFR: 8293114: JVM should trim the native heap [v2]

[Aleksey Shipilev]

> Clean backport to get the important feature to LTS users.
> 
> Additional testing:
>  - [x] Linux AArch64 fastdebug trimming tests
>  - [x] Linux AArch64 fastdebug `tier1`
>  - [x] Linux AArch64 fastdebug `tier2`
>  - [x] Linux AArch64 fastdebug `tier3`

Aleksey Shipilev 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 two additional commits since the last revision:

 - Merge branch 'master' into JDK-8293114-trim-native-heap
 - Backport 9e4fc568a6f1a93c84a84d6cc5220c6eb4e546a5

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

Changes:
  - all: https://git.openjdk.org/jdk21u/pull/13/files
  - new: https://git.openjdk.org/jdk21u/pull/13/files/5300bdaf..c26a154a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u&pr=13&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u&pr=13&range=00-01

  Stats: 46817 lines in 329 files changed: 4409 ins; 40908 del; 1500 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