RFR: 8343477: Remove unnecessary @SuppressWarnings annotations (compiler) [v4]

[Archie Cobbs]

> Please review this patch which removes unnecessary `@SuppressWarnings` annotations.

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 eight additional commits since the last revision:

 - Merge branch 'master' into SuppressWarningsCleanup-compiler
 - Merge branch 'master' into SuppressWarningsCleanup-compiler
 - Update copyright years.
 - Merge branch 'master' into SuppressWarningsCleanup-compiler
 - Merge branch 'master' into SuppressWarningsCleanup-compiler
 - Apply change that was missed somehow.
 - Undo change that will be moved to the core-libs branch.
 - Remove unnecessary @SuppressWarnings annotations.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21851/files
  - new: https://git.openjdk.org/jdk/pull/21851/files/d955b538..8b95d372

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21851&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21851&range=02-03

  Stats: 95175 lines in 2626 files changed: 19948 ins; 68244 del; 6983 mod
  Patch: https://git.openjdk.org/jdk/pull/21851.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21851/head:pull/21851

PR: https://git.openjdk.org/jdk/pull/21851