RFR: 8334999: RISC-V: implement AES single block encryption/decryption intrinsics [v12]

[Arseny Bochkarev]

> Hello everyone! Please review this port of vector AES single block encryption/decryption intrinsics. On my QEMU with `Zvkned` extension enabled the `test/hotspot/jtreg/compiler/codegen/aes/TestAESMain.java` test is OK. I know that currently hardware implementing this extension is not available on the market but I suppose this PR can be a good starting point on supporting AES intrinsics for RISC-V in OpenJDK.

Arseny Bochkarev has updated the pull request incrementally with one additional commit since the last revision:

  Expand the comment on endian swap

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19960/files
  - new: https://git.openjdk.org/jdk/pull/19960/files/0f38182d..a620b6a9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19960&range=11
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19960&range=10-11

  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19960.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19960/head:pull/19960

PR: https://git.openjdk.org/jdk/pull/19960