RFR: 8326111: JFR: Cleanup for JFR_ONLY

[Denghui Dong]

Greeting,

Could I have a review of this trivial change that cleans up code where used JFR_ONLY incorrectly?

testing: build with --enable-jvm-feature-jfr and --disable-jvm-feature-jfr

Denghui

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Commit messages:
 - 8326111: JFR: Cleanup for JFR_ONLY

Changes: https://git.openjdk.org/jdk/pull/17903/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17903&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326111
  Stats: 9 lines in 5 files changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/17903.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17903/head:pull/17903

PR: https://git.openjdk.org/jdk/pull/17903