RFR: JDK-8289106: Add model of class file versions to core reflection [v7]

[Joe Darcy]

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

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 20 additional commits since the last revision:

 - Respond to review feedback.
 - Merge branch 'master' into JDK-8289106
 - Implement code review feedback.
 - Update ClassFileVersionTest.java.
 - Merge branch 'master' into JDK-8289106
 - Appease jcheck.
 - Finish more precise versioned location support; udpate tests.
 - Partial implementation of version-depdendent locations() with tests.
 - Merge branch 'master' into JDK-8289106
 - Merge branch 'master' into JDK-8289106
 - ... and 10 more: https://git.openjdk.org/jdk/compare/6251d510...19f8a2a7

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/9299/files
  - new: https://git.openjdk.org/jdk/pull/9299/files/2e6dfc8e..19f8a2a7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9299&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9299&range=05-06

  Stats: 7346 lines in 313 files changed: 3412 ins; 2227 del; 1707 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