[jdk21u] RFR: 8316592: RISC-V: implement poly1305 intrinsic

Tue Nov 21 17:15:22 UTC 2023

Backport for `_poly1305_processBlocks` intrinsic. Review here: https://github.com/openjdk/jdk/pull/16417. I re-run the `test/jdk/com/sun/crypto/provider/Cipher/ChaCha20/unittest/Poly1305UnitTestDriver.java` test just as a sanity check and it's ok.

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Commit messages:
 - Backport 46e4028adf411b453c94e884a3229f6bdf084369

Changes: https://git.openjdk.org/jdk21u/pull/390/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=390&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316592
  Stats: 237 lines in 4 files changed: 237 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u/pull/390.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/390/head:pull/390

PR: https://git.openjdk.org/jdk21u/pull/390