RFR: 8344079: Minor fixes and cleanups to compiler lint-related code [v2]

[Archie Cobbs]

> Please review these changes with some minor lint-related fixes and cleanups.
> 
> See [JDK-8344079](https://bugs.openjdk.org/browse/JDK-8344079) for a more detailed description.

Archie Cobbs 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 three additional commits since the last revision:

 - Merge branch 'master' into JDK-8344079
 - Fix typo in comment.
 - Minor lint-related cleanups.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/22056/files
  - new: https://git.openjdk.org/jdk/pull/22056/files/de60c11c..8b961d48

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22056&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22056&range=00-01

  Stats: 95175 lines in 2626 files changed: 19948 ins; 68244 del; 6983 mod
  Patch: https://git.openjdk.org/jdk/pull/22056.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22056/head:pull/22056

PR: https://git.openjdk.org/jdk/pull/22056