LibJS: Implement a nearly empty Intl.Locale object

This adds plumbing for the Intl.Locale object, constructor, and
prototype.

Userland/Libraries/LibJS/Runtime/Intl/LocaleConstructor.cpp

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/AbstractOperations.h>
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/Intl/Locale.h>
+#include <LibJS/Runtime/Intl/LocaleConstructor.h>
+
+namespace JS::Intl {
+
+// 14.1 The Intl.Locale Constructor, https://tc39.es/ecma402/#sec-intl-locale-constructor
+LocaleConstructor::LocaleConstructor(GlobalObject& global_object)
+    : NativeFunction(vm().names.Locale.as_string(), *global_object.function_prototype())
+{
+}
+
+void LocaleConstructor::initialize(GlobalObject& global_object)
+{
+    NativeFunction::initialize(global_object);
+
+    auto& vm = this->vm();
+
+    // 14.2.1 Intl.Locale.prototype, https://tc39.es/ecma402/#sec-Intl.Locale.prototype
+    define_direct_property(vm.names.prototype, global_object.intl_locale_prototype(), 0);
+    define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
+}
+
+// 14.1.3 Intl.Locale ( tag [ , options ] ), https://tc39.es/ecma402/#sec-Intl.Locale
+Value LocaleConstructor::call()
+{
+    // 1. If NewTarget is undefined, throw a TypeError exception.
+    vm().throw_exception<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, "Intl.Locale");
+    return {};
+}
+
+// 14.1.3 Intl.Locale ( tag [ , options ] ), https://tc39.es/ecma402/#sec-Intl.Locale
+Value LocaleConstructor::construct(FunctionObject& new_target)
+{
+    auto& vm = this->vm();
+    auto& global_object = this->global_object();
+
+    // 6. Let locale be ? OrdinaryCreateFromConstructor(NewTarget, "%Locale.prototype%", internalSlotsList).
+    auto* locale = ordinary_create_from_constructor<Locale>(global_object, new_target, &GlobalObject::intl_locale_prototype);
+    if (vm.exception())
+        return {};
+
+    return locale;
+}
+
+}