RFR: 8293051: Further refactor javac after removal of -source/-target/--release 7

Fri Sep 2 21:19:11 UTC 2022

This PR is a continuation of PR [1] which removed support for source and target 1.7 option in javac. This is is removing additional switches in javac that were providing support to legacy behavior related to source and target 1.7. What else could be missing?

TIA

[1] https://github.com/openjdk/jdk/pull/10074

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Commit messages:
 - 8293051: Further refactor javac after removal of -source/-target/--release 7

Changes: https://git.openjdk.org/jdk/pull/10150/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10150&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293051
  Stats: 255 lines in 21 files changed: 10 ins; 198 del; 47 mod
  Patch: https://git.openjdk.org/jdk/pull/10150.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10150/head:pull/10150

PR: https://git.openjdk.org/jdk/pull/10150