8349860: Make Class.isArray(), Class.isInterface() and Class.isPrimitive() non-native

src/java.base/share/classes/java/lang/Class.java

@@ -239,6 +239,7 @@ private static void runtimeSetup() {
     private Class(ClassLoader loader, Class<?> arrayComponentType, char mods, ProtectionDomain pd, boolean isPrim) {
         // Initialize final field for classLoader.  The initialization value of non-null
         // prevents future JIT optimizations from assuming this final field is null.
+        // The following assignments are done directly by the VM without calling this constructor.
         classLoader = loader;
         componentType = arrayComponentType;
         modifiers = mods;