Enable Atomics object unconditionally.

https://bugs.webkit.org/show_bug.cgi?id=243342
<rdar://97786341>

Reviewed by Geoffrey Garen and Yusuke Suzuki.

The Atomics object is only being created and made available to the runtime when
SharedArrayBuffer is enabled. In practice this means Atomics is only available when
crossOriginIsolation is true.

Other major browsers expose the Atomics object regardless of the state of crossOriginIsolation.
Using Atomics without shared memory isn't particularly useful but the goal of this is
to improve our interopability with other browsers.

* Source/JavaScriptCore/runtime/JSGlobalObject.cpp:
(JSC::createAtomicsProperty):
(JSC::JSGlobalObject::init):

Canonical link: https://commits.webkit.org/253137@main

Source/JavaScriptCore/runtime/JSGlobalObject.cpp

@@ -318,6 +318,12 @@ static JSValue createReflectProperty(VM& vm, JSObject* object)
     return ReflectObject::create(vm, global, ReflectObject::createStructure(vm, global, global->objectPrototype()));
 }
 
+static JSValue createAtomicsProperty(VM& vm, JSObject *object)
+{
+    JSGlobalObject* global = jsCast<JSGlobalObject*>(object);
+    return AtomicsObject::create(vm, global, AtomicsObject::createStructure(vm, global, global->objectPrototype()));
+}
+
 static JSValue createConsoleProperty(VM& vm, JSObject* object)
 {
     JSGlobalObject* global = jsCast<JSGlobalObject*>(object);
@@ -589,6 +595,7 @@ const GlobalObjectMethodTable JSGlobalObject::s_globalObjectMethodTable = {
   Reflect               createReflectProperty                        DontEnum|PropertyCallback
   JSON                  createJSONProperty                           DontEnum|PropertyCallback
   Math                  createMathProperty                           DontEnum|PropertyCallback
+  Atomics               createAtomicsProperty                        DontEnum|PropertyCallback
   console               createConsoleProperty                        DontEnum|PropertyCallback
   Int8Array             JSGlobalObject::m_typedArrayInt8             DontEnum|ClassStructure
   Int16Array            JSGlobalObject::m_typedArrayInt16            DontEnum|ClassStructure
@@ -1067,10 +1074,6 @@ void JSGlobalObject::init(VM& vm)
     m_regExpConstructor.set(vm, this, regExpConstructor);
     m_linkTimeConstants[static_cast<unsigned>(LinkTimeConstant::RegExp)].set(vm, this, regExpConstructor);
     m_regExpGlobalData.cachedResult().record(vm, this, nullptr, jsEmptyString(vm), MatchResult(0, 0));
-
-    AtomicsObject* atomicsObject = nullptr;
-    if (Options::useSharedArrayBuffer())
-        atomicsObject = AtomicsObject::create(vm, this, AtomicsObject::createStructure(vm, this, m_objectPrototype.get()));
 
 #define CREATE_CONSTRUCTOR_FOR_SIMPLE_TYPE(capitalName, lowerName, properName, instanceType, jsName, prototypeBase, featureFlag) \
 capitalName ## Constructor* lowerName ## Constructor = featureFlag ? capitalName ## Constructor::create(vm, capitalName ## Constructor::createStructure(vm, this, m_functionPrototype.get()), m_ ## lowerName ## Prototype.get(), m_speciesGetterSetter.get()) : nullptr; \
@@ -1151,10 +1154,8 @@ capitalName ## Constructor* lowerName ## Constructor = featureFlag ? capitalName
     putDirectWithoutTransition(vm, vm.propertyNames->Array, arrayConstructor, static_cast<unsigned>(PropertyAttribute::DontEnum));
     putDirectWithoutTransition(vm, vm.propertyNames->RegExp, regExpConstructor, static_cast<unsigned>(PropertyAttribute::DontEnum));
 
-    if (Options::useSharedArrayBuffer()) {
+    if (Options::useSharedArrayBuffer())
         putDirectWithoutTransition(vm, vm.propertyNames->SharedArrayBuffer, m_sharedArrayBufferStructure.constructor(this), static_cast<unsigned>(PropertyAttribute::DontEnum));
-        putDirectWithoutTransition(vm, vm.propertyNames->Atomics, atomicsObject, static_cast<unsigned>(PropertyAttribute::DontEnum));
-    }
 
 #define PUT_CONSTRUCTOR_FOR_SIMPLE_TYPE(capitalName, lowerName, properName, instanceType, jsName, prototypeBase, featureFlag) \
     if (featureFlag) \