Bug 1811411 - Add profiler marker when discarding JitCode r=jandem
Similar to the Discard marker, it seems useful to have a profile marker for
discard events since they can toss a lot of Jit code.
Differential Revision:
https://phabricator.services.mozilla.com/D167896
<!doctype html>
<title>Dragging custom selection breaks layout</title>
<p>Select this sentence, drag it downwards a little, and release it. Pass if you can now select this sentence instead.</p>