RFR: 8255561: add tests to check binary compatibility rules for records [v2]

[Vicente Romero]

> Hi all,
> 
> Please review this change. It is providing compatibility tests for records. The tests are covering the assertions at section: [13.4.27 Evolution of Record Classes](http://cr.openjdk.java.net/~gbierman/8246771/8246771-20200928/specs/records-jls.html#jls-13.4.27).
> 
> Thanks,
> Vicente

Vicente Romero has updated the pull request incrementally with one additional commit since the last revision:

  addressing review comments

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1082/files
  - new: https://git.openjdk.java.net/jdk/pull/1082/files/d1e377c3..16a30015

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1082&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1082&range=00-01

  Stats: 31 lines in 1 file changed: 0 ins; 0 del; 31 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1082.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1082/head:pull/1082

PR: https://git.openjdk.java.net/jdk/pull/1082