RFR: 8244297: memory leak test utility

[Florian Kirmaier]

On Tue, 5 May 2020 10:38:56 GMT, Florian Kirmaier <fkirmaier at openjdk.org> wrote:

>> I'll put this on my queue to review and test it. I left some high-level comments below.
>
> I would suggest making everything configurable in the original library which will be suggested here to be changed.
> I will now add the possibility to make the creation of the heapDump configurable, and also the createGarbage method.
> If something should behave differently by default, then I will just adjust the default values for this copy of the
> library.
> I will improve the documentation in the original Library. How should I add the documentation to the JavaFX project?
> Ideally, I would just reference somewhere to the documentation of the original library. How/Where should I do that?

It's also worth mentioning that this utility allows checking whether an object can not be collected. This is important
because the applications, which are using WeakReferences/WeakListeners often introduce bugs that are hard to debug
because they only happen after the GC has been run.

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