RFR: 8262503: Support records in Dynalink

[Attila Szegedi]

8262503: Support records in Dynalink

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Commit messages:
 - Document behavior changes
 - Add support for records to Dynalink
 - Test the desired functionality

Changes: https://git.openjdk.java.net/jdk/pull/2767/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2767&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262503
  Stats: 165 lines in 8 files changed: 153 ins; 6 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2767.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2767/head:pull/2767

PR: https://git.openjdk.java.net/jdk/pull/2767