[jdk21] RFR: 8309258: RISC-V: Add riscv_hwprobe syscall

Tue Jun 27 07:03:30 UTC 2023

Hi all,

This pull request contains a backport of commit [31b6fd77](https://github.com/openjdk/jdk/commit/31b6fd775f1c4f2841d9a52ad5f275ad446ee661) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Robbin Ehn on 20 Jun 2023 and was reviewed by Feilong Jiang, Thomas Stuefe, Fei Yang and Ludovic Henry.

Thanks!

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Commit messages:
 - Backport 31b6fd775f1c4f2841d9a52ad5f275ad446ee661

Changes: https://git.openjdk.org/jdk21/pull/67/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=67&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309258
  Stats: 583 lines in 5 files changed: 474 ins; 54 del; 55 mod
  Patch: https://git.openjdk.org/jdk21/pull/67.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/67/head:pull/67

PR: https://git.openjdk.org/jdk21/pull/67