[jdk25] RFR: 8358334: C2/Shenandoah: incorrect execution with Unsafe

Tue Jun 17 07:52:16 UTC 2025

Hi all,

This pull request contains a backport of commit [1fcede05](https://github.com/openjdk/jdk/commit/1fcede053cca360c96606c1034b2a365a4fada82) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Roland Westrelin on 12 Jun 2025 and was reviewed by William Kemper and Aleksey Shipilev.

Backport applies cleanly.

Thanks!

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Commit messages:
 - Backport 1fcede053cca360c96606c1034b2a365a4fada82

Changes: https://git.openjdk.org/jdk/pull/25845/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25845&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358334
  Stats: 153 lines in 3 files changed: 117 ins; 26 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/25845.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25845/head:pull/25845

PR: https://git.openjdk.org/jdk/pull/25845