RFR: 8322489 : 22-b27: Up to 7% regression in all Footprint3-*-G1/ZGC

[Markus Grönlund]

Greetings,

A footprint regression was accidentally introduced with [JDK-8211238](https://bugs.openjdk.org/browse/JDK-8211238).

A small part of the JFR system had to be initialized early to support the functionality. We later decided that we only support this functionality iff the system is started with -XX:StartFlightRecording on the command-line.

This PR will adjust to only perform early initialization under this premise.

Testing: jdk_jfr

Thanks
Markus

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Commit messages:
 - 8322489

Changes: https://git.openjdk.org/jdk/pull/17179/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17179&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322489
  Stats: 47 lines in 5 files changed: 29 ins; 9 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/17179.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17179/head:pull/17179

PR: https://git.openjdk.org/jdk/pull/17179