RFR: 8303622 JFR: Missing message with Objects.requireNonNull

[Erik Gahlin]

Could I have a review of a PR that adds a few missing message to Objects.requireNonNull for public API methods.

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/12885/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12885&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303622
  Stats: 22 lines in 6 files changed: 1 ins; 0 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/12885.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12885/head:pull/12885

PR: https://git.openjdk.org/jdk/pull/12885