RFR: 8343478: Remove unnecessary @SuppressWarnings annotations (core-libs) [v4]

[Archie Cobbs]

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

Archie Cobbs has updated the pull request incrementally with one additional commit since the last revision:

  Put back @SuppressWarnings annotations to be fixed by JDK-8343286.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21852/files
  - new: https://git.openjdk.org/jdk/pull/21852/files/a64d5594..9137373f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21852&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21852&range=02-03

  Stats: 3 lines in 2 files changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21852.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21852/head:pull/21852

PR: https://git.openjdk.org/jdk/pull/21852