RFR: 8331931: JFR: Avoid loading regex classes during startup

[Erik Gahlin]

Could I have review of a change that avoids loading 45 regex related classes when using -XX:StartFlightRecording.

Testing: jdk/jdk/jfr

Thanks
Erik

-------------

Commit messages:
 - Remove debug statement
 - Initial

Changes: https://git.openjdk.org/jdk/pull/19146/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19146&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331931
  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/19146.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19146/head:pull/19146

PR: https://git.openjdk.org/jdk/pull/19146