RFR: 8244146: javac changes for JEP 306 [v9]

[Joe Darcy]

> 8244146: javac changes for JEP 306

Joe Darcy has updated the pull request incrementally with two additional commits since the last revision:

 - Fix copyright typo.
 - Update copyrights.

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3831/files
  - new: https://git.openjdk.java.net/jdk/pull/3831/files/3f1aeecc..1d68a284

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3831&range=08
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3831&range=07-08

  Stats: 14 lines in 14 files changed: 0 ins; 0 del; 14 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3831.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3831/head:pull/3831

PR: https://git.openjdk.java.net/jdk/pull/3831