[jdk22u] RFR: 8326936: RISC-V: Shenandoah GC crashes due to incorrect atomic memory operations

[Gui Cao]

Hi, The same issue also exists in the JDK22U: I can reproduce it locally and use this clean patch can fix that issue, So I would like to backport this to JDK22U. This is a risc-v specific change. Backport is clean, risk is low.

### Tests

- [x]  Run tier1 tests on SiFive unmatched (release)

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

Commit messages:
 - Backport a089ed2b9289eeda73bba47ac87e5bc81a4af9dc

Changes: https://git.openjdk.org/jdk22u/pull/90/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk22u&pr=90&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326936
  Stats: 49 lines in 1 file changed: 49 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk22u/pull/90.diff
  Fetch: git fetch https://git.openjdk.org/jdk22u.git pull/90/head:pull/90

PR: https://git.openjdk.org/jdk22u/pull/90