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Add a new flag for spatial nodes that identifies if the spatial node is guaranteed to be identity (no transformation at all) for the entirety of the scene (i.e. either a fixed identity reference frame or a redundant scroll frame). Although not used yet, this will be useful in future to help remove clips during scene building that can't possibly affect the content rendering no matter what occurs during frame building. At the same time, port the other bool fields in spatial node into a single bitflags. Differential Revision: https://phabricator.services.mozilla.com/D84957