RFR: 8246774: Record Classes (final) implementation [v3]

[Vicente Romero]

> Co-authored-by: Vicente Romero <vicente.romero at oracle.com>
> Co-authored-by: Harold Seigel <harold.seigel at oracle.com>
> Co-authored-by: Jonathan Gibbons <jonathan.gibbons at oracle.com>
> Co-authored-by: Brian Goetz <brian.goetz at oracle.com>
> Co-authored-by: Maurizio Cimadamore <maurizio.cimadamore at oracle.com>
> Co-authored-by: Joe Darcy <joe.darcy at oracle.com>
> Co-authored-by: Chris Hegarty <chris.hegarty at oracle.com>
> Co-authored-by: Jan Lahoda <jan.lahoda at oracle.com>

Vicente Romero has updated the pull request incrementally with three additional commits since the last revision:

 - Merge pull request #1 from ChrisHegarty/record-serial-tests
   
   Remove preview args from JDK tests
 - Remove preview args from ObjectMethodsTest
 - Remove preview args from record serialization tests

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/290/files
  - new: https://git.openjdk.java.net/jdk/pull/290/files/543e5054..26b80775

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=290&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=290&range=01-02

  Stats: 95 lines in 21 files changed: 0 ins; 35 del; 60 mod
  Patch: https://git.openjdk.java.net/jdk/pull/290.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/290/head:pull/290

PR: https://git.openjdk.java.net/jdk/pull/290