[jdk21u-dev] RFR: 8331931: JFR: Avoid loading regex classes during startup

[Xiaolong Peng]

Backport [JDK-8331931](https://bugs.openjdk.org/browse/JDK-8331931) JFR: Avoid loading regex classes during startup, resolved one conflict on the copyright year. 

Validation
Run test ```make test TEST=jdk/jdk/jfr```, all tests passed.


Test results: passed: 585
Report written to /local/home/xlpeng/repos/jdk21u-dev/build/linux-x86_64-server-fastdebug/test-results/jtreg_test_jdk_jdk_jfr/html/report.html
Results written to /local/home/xlpeng/repos/jdk21u-dev/build/linux-x86_64-server-fastdebug/test-support/jtreg_test_jdk_jdk_jfr
Finished running test 'jtreg:test/jdk/jdk/jfr'
Test report is stored in build/linux-x86_64-server-fastdebug/test-results/jtreg_test_jdk_jdk_jfr

==============================
Test summary
==============================
   TEST                                              TOTAL  PASS  FAIL ERROR   
   jtreg:test/jdk/jdk/jfr                              585   585     0     0   
==============================
TEST SUCCESS

Finished building target 'test' in configuration 'linux-x86_64-server-fastdebug'

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

Commit messages:
 - Backport 242446b07fcfcac136510495d1ff16d26859aea4

Changes: https://git.openjdk.org/jdk21u-dev/pull/667/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=667&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/jdk21u-dev/pull/667.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/667/head:pull/667

PR: https://git.openjdk.org/jdk21u-dev/pull/667