RFR: 8323716: Only print ZGC Phase Switch events in hs_err files when running with ZGC

[Stefan Karlsson]

On Mon, 15 Jan 2024 10:16:12 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> Don't print the ZGC Phase Switch hs_err section when the JVM is run with other GCs than ZGC.
> 
> I've tested this manually with `-XX:ErrorHandlerTest=3 -version` and verified that the section is logged when ZGC is used, and that it is not logged when G1 is used.

Thanks for the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/17420#issuecomment-1893465200