RFR: 8253455: Record Classes (final) javax.lang.model changes [v2]

[Vicente Romero]

> Please review the fix for [JDK-8253455](https://bugs.openjdk.java.net/browse/JDK-8253455) which is part of the effort
> to make records a final feature of the Java Language. The rest of the code has been published in
> [PR#290](https://github.com/openjdk/jdk/pull/290)  Thanks,
> Vicente

Vicente Romero has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev
excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since
the last revision:

 - adding reminder to remove RECORDS from PreviewFeature
 - Merge branch 'JDK-8253455' of https://github.com/vicente-romero-oracle/jdk into JDK-8253455
 - 8253455: Record Classes (final) javax.lang.model changes
   
   Co-authored-by: Vicente Romero <vicente.romero at oracle.com>
   Co-authored-by: Joe Darcy <joe.darcy at oracle.com>
 - 8253455: Record Classes (final) javax.lang.model changes
   
   Co-authored-by: Vicente Romero <vicente.romero at oracle.com>
   Co-authored-by: Joe Darcy <joe.darcy at oracle.com>

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/291/files
  - new: https://git.openjdk.java.net/jdk/pull/291/files/4814f9e9..9b24af7d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=291&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=291&range=00-01

  Stats: 34575 lines in 777 files changed: 7972 ins; 24236 del; 2367 mod
  Patch: https://git.openjdk.java.net/jdk/pull/291.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/291/head:pull/291

PR: https://git.openjdk.java.net/jdk/pull/291