Refactoring: ClassDescriptor.isFinal, no more Modality.isOverridable

compiler/backend/src/org/jetbrains/kotlin/codegen/MutableClassDescriptor.java

@@ -154,7 +154,7 @@ public class MutableClassDescriptor extends ClassDescriptorBase implements Class
         this.typeConstructor = TypeConstructorImpl.createForClass(
                 this,
                 Annotations.Companion.getEMPTY(),
-                !getModality().isOverridable(),
+                ModalityKt.isFinal(this),
                 getName().asString(),
                 typeParameters,
                 supertypes

compiler/backend/src/org/jetbrains/kotlin/codegen/state/typeMappingUtil.kt

@@ -40,7 +40,7 @@ private fun KotlinType.canHaveSubtypesIgnoringNullability(): Boolean {
 
     when (descriptor) {
         is TypeParameterDescriptor -> return true
-        is ClassDescriptor -> if (descriptor.modality.isOverridable) return true
+        is ClassDescriptor -> if (!descriptor.isFinal) return true
     }
 
     for ((parameter, argument) in constructor.parameters.zip(arguments)) {