[jdk21u-dev] RFR: 8216437: PPC64: Add intrinsic for GHASH algorithm [v2]

[Suchismith Roy]

> Hi all,
> 
> This pull request contains a backport of commit [cdad6d78](https://github.com/openjdk/jdk/commit/cdad6d788de4785c8dbf2710a86fdacb8d070565) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Suchismith Roy on 2 May 2025 and was reviewed by Martin Doerr and Amit Kumar.
> 
> Thanks!

Suchismith Roy has updated the pull request incrementally with one additional commit since the last revision:

  Update Conditional register names

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

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/1789/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/1789/files/76a3b83f..bf0ad564

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1789&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1789&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1789.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1789/head:pull/1789

PR: https://git.openjdk.org/jdk21u-dev/pull/1789