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f1a9ceed4f
Add an off-by-default allocator mode that tracks all live allocations with sizes and associated stack traces. We also track if each allocation is visited as part of a measuring heap usage in `about:memory`, allowing us to report on allocations that are not tracked yet. Right now the list of untracked allocations is dumped to stdout; I have a python script coming in a separate PR which makes it easier to perform analysis on the massive output. Testing: Manually tested with `./mach build -d --features servo_allocator/allocation-tracking` and visiting about:memory. Part of: #11559 --------- Signed-off-by: Josh Matthews <josh@joshmatthews.net>