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Avoid calling JS_WrapValue for same-compartment DOM reflectors This change shaves off 15-20ns per iteration of the node.firstChild getter test in tests/html/bindings_perf.html. Based on [similar Gecko code](http://searchfox.org/mozilla-central/rev/f43c9e0ffa92e72dbdbcbf57eecf04a43d46da63/dom/bindings/BindingUtils.h#781). --- - [X] `./mach build -d` does not report any errors - [X] `./mach test-tidy` does not report any errors - [X] These changes fix (partially) #12358 <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/12395) <!-- Reviewable:end -->