[jdk25u] RFR: 8366223: ZGC: ZPageAllocator::cleanup_failed_commit_multi_partition is broken [v2]

[Axel Boldt-Christmas]

> Hi all,
> 
> This pull request contains a backport of commit [501e6aed](https://github.com/openjdk/jdk/commit/501e6aed4407d63b000320168dc5d0553ce8a23b) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Axel Boldt-Christmas on 28 Aug 2025 and was reviewed by Stefan Karlsson and Joel Sikström.
> 
> Thanks!

Axel Boldt-Christmas has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Backport 501e6aed4407d63b000320168dc5d0553ce8a23b

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

Changes:
  - all: https://git.openjdk.org/jdk25u/pull/141/files
  - new: https://git.openjdk.org/jdk25u/pull/141/files/c1e2fc62..75e46aa4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk25u&pr=141&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk25u&pr=141&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk25u/pull/141.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/141/head:pull/141

PR: https://git.openjdk.org/jdk25u/pull/141