RFR: 8358543: Remove CommentChecker.java and DirDiff.java

Tue Jun 3 20:18:19 UTC 2025

These two tools were moved to src/utils/src/build/tools/ during the build-infra project. It was not part of the build, but two standalone tools that nobody knew who created or who used them.

I think we can safely delete them now.

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Commit messages:
 - 8358543: Remove CommentChecker.java and DirDiff.java

Changes: https://git.openjdk.org/jdk/pull/25629/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25629&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358543
  Stats: 492 lines in 2 files changed: 0 ins; 492 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/25629.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25629/head:pull/25629

PR: https://git.openjdk.org/jdk/pull/25629