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

[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

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Commit messages:
 - 8253455: Record Classes (final) javax.lang.model changes

Changes: https://git.openjdk.java.net/jdk/pull/291/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=291&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253455
  Stats: 134 lines in 12 files changed: 0 ins; 130 del; 4 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