RFR: 8292336: JFR: Warn users if -XX:StartFlightRecording:disk=false is specified with maxage or maxsize

[Erik Gahlin]

Hi,

Could I have a review of PR that adds a warning message if maxage or maxsize is set when disk = false.

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/10508/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10508&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292336
  Stats: 8 lines in 1 file changed: 8 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10508.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10508/head:pull/10508

PR: https://git.openjdk.org/jdk/pull/10508