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When there are a large number of sibling backdrop-filter primitives present, the existing naive recursive traversals to assign the `render_on` and `free_after` passes hit pathological cases. In the test case for this bug, a debug build takes 12+ seconds to complete on my development machine. Instead, switch to a topological sort for `render_on` assignment, and use a non-recursive traversal to set `free_after` (which relies on having the passes in-order from the topo sort to avoid recursion). Differential Revision: https://phabricator.services.mozilla.com/D144359