[foreign-jextract] RFR: 8240181: jextract does not generate constants for anonymous enum fields

[Athijegannathan Sundararajan]

anonymous enums were filtered by TreeMaker.

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

Commits:
 - bde12086: added bugid to the test.
 - a293c4d1: 8240181: jextract does not generate constants for anonymous enum fields

Changes: https://git.openjdk.java.net/panama-foreign/pull/35/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/35/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8240181
  Stats: 91 lines in 4 files changed: 90 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/35.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/35/head:pull/35

PR: https://git.openjdk.java.net/panama-foreign/pull/35