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b5babda288
Avoid expensive cross-hierarchy dynamic_cast from JS::Object to UniversalGlobalScopeMixin on every microtask checkpoint. Since UniversalGlobalScopeMixin is not in the JS::Object inheritance chain, as<UniversalGlobalScopeMixin>(JS::Object&) falls through to dynamic_cast, which is very costly. Profiling showed this taking ~14% of total CPU time. Add EnvironmentSettingsObject::universal_global_scope() backed by a pointer cached eagerly during initialization.