RFR: 8253455: Record Classes javax.lang.model changes [v5]

[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 incrementally with one additional commit since the last revision:

  adding a comment to PreviewFeature.Feature

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/291/files
  - new: https://git.openjdk.java.net/jdk/pull/291/files/aeb799ff..f5682fc2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=291&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=291&range=03-04

  Stats: 7 lines in 1 file changed: 6 ins; 0 del; 1 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