RFR: 8371820: Further AES performance improvements for key schedule generation [v5]

[Martin Doerr]

> This fix simplifies the hotspot intrinsics for some platforms and optimizes the key computation for encryption. We can save the `genInvRoundKeys` computation when we only do encryption.
> 
> The micro:org.openjdk.bench.javax.crypto.AESReinit benchmark results are improved by 17% for ppc64 and 26% for x86_64.

Martin Doerr has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - Address review comments.
 - Merge remote-tracking branch 'origin' into 8371820_AES_Crypt
 - Remove K from AES_Crypt
 - More minor cleanup.
 - Improve comment and minor cleanup.
 - 8371820: Further AES performance improvements for key schedule generation

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28299/files
  - new: https://git.openjdk.org/jdk/pull/28299/files/2b981288..30b5b531

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28299&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28299&range=03-04

  Stats: 65976 lines in 954 files changed: 44668 ins; 14938 del; 6370 mod
  Patch: https://git.openjdk.org/jdk/pull/28299.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28299/head:pull/28299

PR: https://git.openjdk.org/jdk/pull/28299