RFR: 8343477: Remove unnecessary @SuppressWarnings annotations (compiler) [v6]

[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 10 additional commits since the last revision:

 - Merge branch 'master' into SuppressWarningsCleanup-compiler
 - Merge branch 'master' into SuppressWarningsCleanup-compiler
 - 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/af81a548..58bed339

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21851&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21851&range=04-05

  Stats: 135916 lines in 2693 files changed: 95118 ins; 30317 del; 10481 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