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LibWeb: Add fast-paths for wrapping already-wrapped C++ objects
If a C++ object already has a JS wrapper, we don't need to go through the expensive type checks to figure out which kind of wrapper to create. Instead, just return the wrapper we already have! This gives a noticeable increase in smoothness on Acid3, where ~10% of CPU time was previously spent doing RTTI type checks in wrap(). With these changes, it's down to ~1%.
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@ -176,6 +176,9 @@ namespace Web::Bindings {
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NodeWrapper* wrap(JS::GlobalObject& global_object, DOM::Node& node)
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{
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if (node.wrapper())
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return static_cast<NodeWrapper*>(node.wrapper());
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if (is<DOM::Document>(node))
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return static_cast<NodeWrapper*>(wrap_impl(global_object, verify_cast<DOM::Document>(node)));
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if (is<DOM::DocumentType>(node))
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