Check if the class is special by FQ name

This is needed because our built-ins can be loaded with two different
mechanisms (deserialization and lazy resolve) and, when that happens,
corresponding descriptors aren't equal to each other, so one of two resolved
descriptors for Any (or the same with Nothing) was never considered to be a
"special class" with no supertypes

compiler/builtins-serializer/src/BuiltInsSerializer.kt

@@ -43,6 +43,7 @@ import org.jetbrains.jet.di.InjectorForJavaDescriptorResolverUtil
 import org.jetbrains.jet.lang.descriptors.ModuleDescriptor
 import org.jetbrains.jet.lang.resolve.name.FqName
 import com.intellij.util.containers.ContainerUtil
+import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns
 
 public class BuiltInsSerializer(val out: PrintStream?) {
     private var totalSize = 0
@@ -96,11 +97,8 @@ public class BuiltInsSerializer(val out: PrintStream?) {
         // DescriptorValidator.validate(packageView)
 
         val serializer = DescriptorSerializer(object : SerializerExtension() {
-            private val set = setOf("Any", "Nothing")
-
-            override fun hasSupertypes(descriptor: ClassDescriptor): Boolean {
-                return descriptor.getName().asString() !in set
-            }
+            override fun hasSupertypes(descriptor: ClassDescriptor): Boolean =
+                    !KotlinBuiltIns.isSpecialClassWithNoSupertypes(descriptor)
         })
 
         val classNames = ArrayList<Name>()