[lworld] RFR: 8273202: Emit parameter names for primitive record factories

[Jesper Steen Møller]

8273202: Ensure that parameter primitive record factories are generated.

Note that this fix requires JDK-8273018 (PR #541).

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Commit messages:
 - 8273202: Test which tests reflection of parameter names and ability to construct primitive records.
 - 8273018: Emit parameter annotations on primitive record factories

Changes: https://git.openjdk.java.net/valhalla/pull/542/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=542&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273202
  Stats: 169 lines in 4 files changed: 168 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/542.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/542/head:pull/542

PR: https://git.openjdk.java.net/valhalla/pull/542