[jdk21u] RFR: 8317692: jcmd GC.heap_dump performance regression after JDK-8292818 [v2]

[Hannes Greule]

> Hi all,
> 
> This pull request contains a backport of commit [8f5f4407](https://github.com/openjdk/jdk/commit/8f5f44070a7c6dbbbd1005f9d0af5ab7c35179df) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Hannes Greule on 19 Oct 2023 and was reviewed by Alex Menkov and Frederic Parain.
> 
> Thanks!

Hannes Greule 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 SirYwell-backport-8f5f4407
 - Backport 8f5f44070a7c6dbbbd1005f9d0af5ab7c35179df

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

Changes:
  - all: https://git.openjdk.org/jdk21u/pull/274/files
  - new: https://git.openjdk.org/jdk21u/pull/274/files/24ee5148..7e328f0d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u&pr=274&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u&pr=274&range=00-01

  Stats: 643 lines in 33 files changed: 544 ins; 21 del; 78 mod
  Patch: https://git.openjdk.org/jdk21u/pull/274.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/274/head:pull/274

PR: https://git.openjdk.org/jdk21u/pull/274