RFR: 8315051: jdk/jfr/jvm/TestGetEventWriter.java fails with non-JVMCI GCs

[Erik Gahlin]

On Mon, 28 Aug 2023 13:15:37 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> See the bug for example test failure. There are two ways to fix it: bring in `Whitebox` and sense the JVMCI support from there, or use the `@requires` to sense this and other conditions for JVMCI enablement then. `@requires` seems safer, so I did that one.
> 
> Additional testing:
>  - [x] Affected test with `-XX:+UseShenandoahGC` (now passes)
>  - [x] Affected test with `-XX:+UseParallelGC` (still passes)

Marked as reviewed by egahlin (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15446#pullrequestreview-1604509776