RFR: 8253821: Improve ByteBuffer performance with GCM [v3]

[Anthony Scarpino]

> 8253821: Improve ByteBuffer performance with GCM

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

 - style
 - style & comments
 - full update
 - remove old
 - update
 - outputsize

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/411/files
  - new: https://git.openjdk.java.net/jdk/pull/411/files/b29c1ed5..7c54017f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=411&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=411&range=01-02

  Stats: 857 lines in 6 files changed: 635 ins; 133 del; 89 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