RFR: 8267125: AES Galois CounterMode (GCM) interleaved implementation using AVX512 + VAES instructions [v7]

[Smita Kamath]

> I would like to submit AES-GCM optimization for x86_64 architectures supporting AVX3+VAES (Evex encoded AES). This optimization interleaves AES and GHASH operations.
> Performance gain of ~1.5x - 2x for message sizes 8k and above.

Smita Kamath has updated the pull request incrementally with five additional commits since the last revision:

 - Merge branch 'aes-gcm' of github.com:smita-kamath/jdk into aes-gcm
 - Updates, comment and variable cleanup
 - merge rest
 - merge
 - fixes and code comments

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4019/files
  - new: https://git.openjdk.java.net/jdk/pull/4019/files/0f834eed..69145008

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4019&range=06
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4019&range=05-06

  Stats: 219 lines in 1 file changed: 83 ins; 60 del; 76 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4019.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4019/head:pull/4019

PR: https://git.openjdk.java.net/jdk/pull/4019