Add isData() to ClassDescriptor

core/deserialization/src/org/jetbrains/kotlin/serialization/Flags.java

@@ -88,13 +88,15 @@ public class Flags {
             Modality modality,
             ClassKind kind,
             boolean inner,
-            boolean isCompanionObject
+            boolean isCompanionObject,
+            boolean isData
     ) {
         return HAS_ANNOTATIONS.toFlags(hasAnnotations)
                | MODALITY.toFlags(modality(modality))
                | VISIBILITY.toFlags(visibility(visibility))
                | CLASS_KIND.toFlags(classKind(kind, isCompanionObject))
                | IS_INNER.toFlags(inner)
+               | IS_DATA.toFlags(isData)
                ;
     }
 

core/deserialization/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedClassDescriptor.kt

@@ -54,6 +54,7 @@ public class DeserializedClassDescriptor(
     private val kind = Deserialization.classKind(kindFromProto)
     private val isCompanion = kindFromProto == ProtoBuf.Class.Kind.COMPANION_OBJECT
     private val isInner = Flags.IS_INNER.get(classProto.getFlags())
+    private val isData = Flags.IS_DATA.get(classProto.flags)
 
     val c = outerContext.childContext(this, classProto.typeParameterList, nameResolver, TypeTable(classProto.typeTable))
 
@@ -90,6 +91,8 @@ public class DeserializedClassDescriptor(
 
     override fun isInner() = isInner
 
+    override fun isData() = isData
+
     override fun getAnnotations() = annotations
 
     override fun getUnsubstitutedMemberScope() = memberScope