RFR: JDK-8309574: Improve core reflection tests for JEP 445 [v2]

[Joe Darcy]

> Add some basic core reflections tests for unnamed classes.

Joe Darcy has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Added end of file newline.
 - Merge branch 'master' into JDK-8309574
 - JDK-8309574: Improve core reflection tests for JEP 445

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14345/files
  - new: https://git.openjdk.org/jdk/pull/14345/files/bcf92b02..8a3f4666

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14345&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14345&range=00-01

  Stats: 25550 lines in 211 files changed: 20977 ins; 4370 del; 203 mod
  Patch: https://git.openjdk.org/jdk/pull/14345.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14345/head:pull/14345

PR: https://git.openjdk.org/jdk/pull/14345