RFR: JDK-8309503: Improve javax.lang.model tests for JEP 445 [v5]

[Joe Darcy]

> Improve testing methodology for unnamed classes in javax.lang.model, including coverage of binary names.

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Improve test.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14321/files
  - new: https://git.openjdk.org/jdk/pull/14321/files/e1b5328a..248832b5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14321&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14321&range=03-04

  Stats: 17 lines in 1 file changed: 7 ins; 0 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/14321.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14321/head:pull/14321

PR: https://git.openjdk.org/jdk/pull/14321