RFR: 8294931 JFR: Simplify SettingInfo

[Erik Gahlin]

Hi,

Could Have a review of a PR that simplifies code related to SettingInfo.

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/10599/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10599&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294931
  Stats: 43 lines in 4 files changed: 7 ins; 21 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/10599.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10599/head:pull/10599

PR: https://git.openjdk.org/jdk/pull/10599