[jdk21u] RFR: 8313779: RISC-V: use andn / orn in the MD5 instrinsic

Thu Sep 28 09:27:50 UTC 2023

Hi all,
This pull request contains a backport of commit [4726960f](https://github.com/openjdk/jdk/commit/4726960fcdc9489fb8f9c7e1a100828f1347c30c) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

MD5 implementation already backported to jdk21u: [4eafc45](https://github.com/openjdk/jdk21u/commit/4eafc454c2df46e99106920713050065000efc24)

The commit being backported was authored by Antonios Printezis on 7 Aug 2023 and was reviewed by Ludovic Henry and Fei Yang.

Thanks!

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Commit messages:
 - Backport 4726960fcdc9489fb8f9c7e1a100828f1347c30c

Changes: https://git.openjdk.org/jdk21u/pull/209/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=209&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313779
  Stats: 35 lines in 3 files changed: 26 ins; 3 del; 6 mod
  Patch: https://git.openjdk.org/jdk21u/pull/209.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/209/head:pull/209

PR: https://git.openjdk.org/jdk21u/pull/209