[Bug 775541] leaks: Implement ref/unref tracing in the leaks tracer

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775541

--- Comment #7 from Guillaume Desmottes <gdesmott at gnome.org> ---
(In reply to Tim-Philipp Müller from comment #4)
> The problem with this data is that it's just a LOT of data - does it really
> help figure out leaks in non-trivial pipelines?

I think it does yeah.
When I was debugging loads of gst leaks to test my leas tracer, I sometimes
ended up tracking individual ref/unref calls using gdb (
https://blog.desmottes.be/?post/2015/03/30/Tracking-the-ref-count-of-a-GstMiniObject
).
So this may be an useful addition.

Would be good to update docs/design/part-tracing.txt with an example.

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