RFR: 8253821: Improve ByteBuffer performance with GCM [v4]

[Anthony Scarpino]

On Fri, 23 Oct 2020 16:35:10 GMT, Anthony Scarpino <ascarpino at openjdk.org> wrote:

>> I will take a look as well.
>
> This is an update for all of Valerie's comments and adding a test to verify different buffer types and configurations

The latest update should address all outstanding comments.  The biggest change was to the test, which had major reorganization and created tests that increments data sizes for update and doFinal ops byte-by-byte to check for any errors.  That should reduce concerns about buffer corruption.

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PR: https://git.openjdk.java.net/jdk/pull/411