RFR: 8307057 JFR: Enable -XX:+DebugNonSafepoints when JFR starts

[Erik Gahlin]

Could I have review of a change that enables DebugNonSafepoints when JFR starts.

Testing: tier1, tier2, tier3, tier4

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/14147/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14147&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307057
  Stats: 9 lines in 2 files changed: 9 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14147.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14147/head:pull/14147

PR: https://git.openjdk.org/jdk/pull/14147