LibJS: Add preparation for Intl constructors and prototypes

Add a JS_ENUMERATE_INTL_OBJECTS macro and use it to generate:

- Forward declarations
- CommonPropertyNames class name members
- Constructor and prototype GlobalObject members, getters, visitors,
  and initialize_constructor() calls

Userland/Libraries/LibJS/Forward.h

@@ -76,6 +76,8 @@
     __JS_ENUMERATE(Float32Array, float32_array, Float32ArrayPrototype, Float32ArrayConstructor, float)                          \
     __JS_ENUMERATE(Float64Array, float64_array, Float64ArrayPrototype, Float64ArrayConstructor, double)
 
+#define JS_ENUMERATE_INTL_OBJECTS
+
 #define JS_ENUMERATE_TEMPORAL_OBJECTS                                                                    \
     __JS_ENUMERATE(Calendar, calendar, CalendarPrototype, CalendarConstructor)                           \
     __JS_ENUMERATE(Duration, duration, DurationPrototype, DurationConstructor)                           \
@@ -197,6 +199,15 @@ JS_ENUMERATE_NATIVE_ERRORS
 JS_ENUMERATE_TYPED_ARRAYS
 #undef __JS_ENUMERATE
 
+namespace Intl {
+#define __JS_ENUMERATE(ClassName, snake_name, ConstructorName, PrototypeName) \
+    class ClassName;                                                          \
+    class ConstructorName;                                                    \
+    class PrototypeName;
+JS_ENUMERATE_INTL_OBJECTS
+#undef __JS_ENUMERATE
+};
+
 namespace Temporal {
 #define __JS_ENUMERATE(ClassName, snake_name, ConstructorName, PrototypeName) \
     class ClassName;                                                          \

Userland/Libraries/LibJS/Runtime/CommonPropertyNames.h

@@ -440,6 +440,9 @@ struct CommonPropertyNames {
 #define __JS_ENUMERATE(x, a, b, c, t) PropertyName x { #x, PropertyName::StringMayBeNumber::No };
     JS_ENUMERATE_BUILTIN_TYPES
 #undef __JS_ENUMERATE
+#define __JS_ENUMERATE(x, a, b, c) PropertyName x { #x, PropertyName::StringMayBeNumber::No };
+    JS_ENUMERATE_INTL_OBJECTS
+#undef __JS_ENUMERATE
 #define __JS_ENUMERATE(x, a, b, c) PropertyName x { #x, PropertyName::StringMayBeNumber::No };
     JS_ENUMERATE_TEMPORAL_OBJECTS
 #undef __JS_ENUMERATE

Userland/Libraries/LibJS/Runtime/GlobalObject.cpp

@@ -154,6 +154,18 @@ void GlobalObject::initialize_global_object()
     JS_ENUMERATE_BUILTIN_TYPES
 #undef __JS_ENUMERATE
 
+#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
+    if (!m_intl_##snake_name##_prototype)                                     \
+        m_intl_##snake_name##_prototype = heap().allocate<Intl::PrototypeName>(*this, *this);
+    JS_ENUMERATE_INTL_OBJECTS
+#undef __JS_ENUMERATE
+
+    // Must be allocated before `Intl::Intl` below.
+#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
+    initialize_constructor(vm.names.ClassName, m_intl_##snake_name##_constructor, m_intl_##snake_name##_prototype);
+    JS_ENUMERATE_INTL_OBJECTS
+#undef __JS_ENUMERATE
+
 #define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
     if (!m_temporal_##snake_name##_prototype)                                 \
         m_temporal_##snake_name##_prototype = heap().allocate<Temporal::PrototypeName>(*this, *this);
@@ -276,6 +288,12 @@ void GlobalObject::visit_edges(Visitor& visitor)
     JS_ENUMERATE_BUILTIN_TYPES
 #undef __JS_ENUMERATE
 
+#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
+    visitor.visit(m_intl_##snake_name##_constructor);                         \
+    visitor.visit(m_intl_##snake_name##_prototype);
+    JS_ENUMERATE_INTL_OBJECTS
+#undef __JS_ENUMERATE
+
 #define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
     visitor.visit(m_temporal_##snake_name##_constructor);                     \
     visitor.visit(m_temporal_##snake_name##_prototype);

Userland/Libraries/LibJS/Runtime/GlobalObject.h

@@ -47,6 +47,12 @@ public:
     JS_ENUMERATE_BUILTIN_TYPES
 #undef __JS_ENUMERATE
 
+#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName)                              \
+    Intl::ConstructorName* intl_##snake_name##_constructor() { return m_intl_##snake_name##_constructor; } \
+    Object* intl_##snake_name##_prototype() { return m_intl_##snake_name##_prototype; }
+    JS_ENUMERATE_INTL_OBJECTS
+#undef __JS_ENUMERATE
+
 #define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName)                                          \
     Temporal::ConstructorName* temporal_##snake_name##_constructor() { return m_temporal_##snake_name##_constructor; } \
     Object* temporal_##snake_name##_prototype() { return m_temporal_##snake_name##_prototype; }
@@ -107,6 +113,12 @@ private:
     JS_ENUMERATE_BUILTIN_TYPES
 #undef __JS_ENUMERATE
 
+#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName) \
+    Intl::ConstructorName* m_intl_##snake_name##_constructor { nullptr };     \
+    Object* m_intl_##snake_name##_prototype { nullptr };
+    JS_ENUMERATE_INTL_OBJECTS
+#undef __JS_ENUMERATE
+
 #define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName)     \
     Temporal::ConstructorName* m_temporal_##snake_name##_constructor { nullptr }; \
     Object* m_temporal_##snake_name##_prototype { nullptr };