[jdk22u] RFR: 8321075: RISC-V: UseSystemMemoryBarrier lacking proper OS support

Mon Mar 4 08:38:12 UTC 2024

Hi all,

This pull request contains a backport of commit [68eb5a1d](https://github.com/openjdk/jdk/commit/68eb5a1df5afdc011aa467f1c723a8792532dd3f) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Robbin Ehn on 21 Feb 2024 and was reviewed by Fei Yang, Yadong Wang and Ludovic Henry.

Thanks!

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Commit messages:
 - Backport 68eb5a1df5afdc011aa467f1c723a8792532dd3f

Changes: https://git.openjdk.org/jdk22u/pull/83/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk22u&pr=83&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321075
  Stats: 40 lines in 3 files changed: 39 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk22u/pull/83.diff
  Fetch: git fetch https://git.openjdk.org/jdk22u.git pull/83/head:pull/83

PR: https://git.openjdk.org/jdk22u/pull/83