RFR: JDK-8299672: Enhance HeapDump JFR event

[Erik Gahlin]

On Tue, 10 Jan 2023 08:19:33 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> The support for gzipped heap dumps was added recently with "8237354: Add option to jcmd to write a gzipped heap dump" but not reflected in JFR so I wanted to add it here too to get a full picture of the heap dump creation.
> The overwrite field was just added for completion, no specific reason.

Not sure what the user is going to do with the information, but OK.

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PR: https://git.openjdk.org/jdk/pull/11864