RFR: 8349721: Add aarch64 intrinsics for ML-KEM [v8]

[Ferenc Rakoczi]

> By using the aarch64 vector registers the speed of the computation of the ML-KEM algorithms (key generation, encapsulation, decapsulation) can be approximately doubled.

Ferenc Rakoczi has updated the pull request incrementally with one additional commit since the last revision:

  Clarified comments as suggested by Andrew Dinn

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23663/files
  - new: https://git.openjdk.org/jdk/pull/23663/files/74ff3d9f..d7f7fc8e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23663&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23663&range=06-07

  Stats: 134 lines in 3 files changed: 96 ins; 4 del; 34 mod
  Patch: https://git.openjdk.org/jdk/pull/23663.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23663/head:pull/23663

PR: https://git.openjdk.org/jdk/pull/23663