RFR: JDK-8322100: Fix GCMIncrementByte4 & GCMIncrementDirect4, and increase overlap testing

[Anthony Scarpino]

Hi,

I need a review of a few simple test changes.  This fixes a failure with two manually run AES/GCM tests that depended on another test that changed with [JDK-8318756](https://bugs.openjdk.org/browse/JDK-8318756).  It also adds testing for overlapping buffers that AES/GCM has, but CC20P1305 needs after JDK-8318756 was included.

After the change, manual testing of GCMIncrementByte4 and GCMIncrementDirect4 were successfully and automated tests passed as well.

thanks

Tony

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Commit messages:
 - fix

Changes: https://git.openjdk.org/jdk/pull/17362/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17362&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322100
  Stats: 127 lines in 4 files changed: 99 ins; 7 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/17362.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17362/head:pull/17362

PR: https://git.openjdk.org/jdk/pull/17362