RFR: 8316927: JFR: Move shouldCommit check earlier for socket events

[Erik Gahlin]

Hi,

The events for socket read and socket write retrieves the remote address even in cases where the event didn't exceed the threshold. By moving the shouldCommit check earlier, it can be avoided. 

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Socket write event
 - Initial

Changes: https://git.openjdk.org/jdk/pull/15908/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15908&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316927
  Stats: 47 lines in 4 files changed: 20 ins; 6 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/15908.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15908/head:pull/15908

PR: https://git.openjdk.org/jdk/pull/15908