RFR: 8365614: JFR: Improve PrettyWriter::printValue

[Markus Grönlund]

On Sun, 17 Aug 2025 11:30:51 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

> Could I have a review of a PR  that simplifies the PrettyWriter::printValue method so it uses switch expression. It also changes so null is never passed to the method, making the code more robust.
> 
> Testing: jdk/jdk/jfr  + manual comparison of output before and after so it hasn't changed

Marked as reviewed by mgronlun (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26810#pullrequestreview-3131991254