RFR: 8278757: [s390] Implement AES Counter Mode Intrinsic

[Lutz Schmidt]

On Thu, 7 Apr 2022 10:02:07 GMT, Lutz Schmidt <lucy at openjdk.org> wrote:

> Please review (and approve, if possible) this pull request.
> 
> This is a s390-only enhancement. It introduces the implementation of an AES-CTR intrinsic, making use of the specific s390 instruction for AES counter-mode encryption.
> 
> Testing: SAP does no longer maintain a full build and test environment for s390. Testing is therefore limited to running some test suites (SPECjbb*, SPECjvm*) manually. But: identical code is contained in SAP's commercial product and thoroughly tested in that context. No issues were uncovered.
> 
> @backwaterred Could you please conduct some "official" testing for this PR? 
> 
> Thank you all!

Once again:
With only s390 files in the changeset, there is no way for this PR to fail linux x86 tests.

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PR: https://git.openjdk.java.net/jdk/pull/8142