RFR: 8253821: Improve ByteBuffer performance with GCM [v5]

[Anthony Scarpino]

> 8253821: Improve ByteBuffer performance with GCM

Anthony Scarpino has updated the pull request incrementally with five additional commits since the last revision:

 - test updates
 - test check mixup
 - Overlap protection
 - Updated code comments, all tests pass
 - Updated code comments, all tests pass

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/411/files
  - new: https://git.openjdk.java.net/jdk/pull/411/files/8580c6ec..836bf3ed

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=411&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=411&range=03-04

  Stats: 745 lines in 6 files changed: 543 ins; 48 del; 154 mod
  Patch: https://git.openjdk.java.net/jdk/pull/411.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/411/head:pull/411

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