[Rev 03] RFR: 8244297: memory leak test utility

[Florian Kirmaier]

On Thu, 7 May 2020 16:58:52 GMT, Jesper Skov <github.com+2720909+jskov at openjdk.org> wrote:

>> I've now added also some JavaDoc to the public methods.
>
> What I tried asking from my work account is: what is the purpose of createGarbage?

The createGarbage method stimulates the GC. All unit tests are green without it, but according to my memory some tests
in an earlier version of this library were unstable without this. I can also change the configuration to create 0
garbage.

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PR: https://git.openjdk.java.net/jfx/pull/204