RFR: 8338512: JFR: Revert changes to TestCodeSweeper

[Erik Gahlin]

Could I have a review of a PR that reverts the change to TestCodeSweeper.java.

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/20617/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20617&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338512
  Stats: 41 lines in 2 files changed: 3 ins; 24 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/20617.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20617/head:pull/20617

PR: https://git.openjdk.org/jdk/pull/20617