[jdk21u-dev] RFR: 8321075: RISC-V: UseSystemMemoryBarrier lacking proper OS support [v3]

[Ludovic Henry]

> 8321075: RISC-V: UseSystemMemoryBarrier lacking proper OS support

Ludovic Henry 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 three additional commits since the last revision:

 - Merge branch 'master' of github.com:openjdk/jdk21u into backport-luhenry-68eb5a1d
 - Merge branch 'master' of github.com:openjdk/jdk21u into backport-luhenry-68eb5a1d
 - Backport 68eb5a1df5afdc011aa467f1c723a8792532dd3f

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

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/294/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/294/files/504dd88c..f4e25f80

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=294&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=294&range=01-02

  Stats: 92 lines in 2 files changed: 85 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/294.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/294/head:pull/294

PR: https://git.openjdk.org/jdk21u-dev/pull/294