RFR: 8364556: JFR: Disable SymbolTableStatistics and StringTableStatistics in default.jfc

[Erik Gahlin]

Could I have a review of PR that disabled two events in the default configuration due to the runtime impact.

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/26620/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26620&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364556
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/26620.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26620/head:pull/26620

PR: https://git.openjdk.org/jdk/pull/26620