Address changes from JEP 445 to JEP 463. - Move from a SYNTHETIC unnamed class to a MANDATED implicit class.
- Don't mark class on read. - Remove reflection and annotation processing related to unnamed classes. - Simplify main method search. ------------- Commit messages: - Implicit classes and instance main methods Changes: https://git.openjdk.org/jdk/pull/16461/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16461&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8315458 Stats: 344 lines in 36 files changed: 12 ins; 231 del; 101 mod Patch: https://git.openjdk.org/jdk/pull/16461.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/16461/head:pull/16461 PR: https://git.openjdk.org/jdk/pull/16461
