RFR: JDK-8289106: Add model of class file versions to core reflection [v4]

[Joe Darcy]

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

Joe Darcy has updated the pull request incrementally with two additional commits since the last revision:

 - Finish more precise versioned location support; udpate tests.
 - Partial implementation of version-depdendent locations() with tests.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9299/files
  - new: https://git.openjdk.org/jdk/pull/9299/files/998b6f6b..f747eb41

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9299&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9299&range=02-03

  Stats: 470 lines in 4 files changed: 439 ins; 4 del; 27 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