RFR: 8364461: JFR: Default constructor may not be first in setting control

[Erik Gahlin]

Could I have a review of a PR that fixes a bug occurring when a user-defined setting does not have the default constructor first?

Test: test/jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/26582/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26582&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364461
  Stats: 28 lines in 2 files changed: 20 ins; 7 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26582.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26582/head:pull/26582

PR: https://git.openjdk.org/jdk/pull/26582