RFR: JDK-8289106: Add model of class file versions to core reflection [v5]

[Joe Darcy]

> JDK-8289106: Add model of class file versions to core reflection

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

  Appease jcheck.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9299/files
  - new: https://git.openjdk.org/jdk/pull/9299/files/f747eb41..34aa4f42

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9299&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9299&range=03-04

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9299.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9299/head:pull/9299

PR: https://git.openjdk.org/jdk/pull/9299