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Auto merge of #8227 - asajeffrey:versioned_dom, r=eefriedman
Versioned dom This PR adds versioning to the DOM. There are now node.get_version and node.get_descendent_version methods that return a counter that is bumped when the node is dirtied. This is used to implement cache invalidation for caching HTMLCollection state. Caching HTMCollections gets a 1000x speedup in the Dromaeo DOM query tests. Addresses #6901, #3381 and #1916. Replaces PR #6927. <!-- Reviewable:start --> [<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/8227) <!-- Reviewable:end -->
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