Introduce PackagePartSource to store part class name in deserialized descriptors

Not used at the moment, will be in the following commits

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/kotlin/DeserializedDescriptorResolver.java

@@ -23,6 +23,7 @@ import org.jetbrains.kotlin.descriptors.ClassDescriptor;
 import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor;
 import org.jetbrains.kotlin.load.kotlin.header.KotlinClassHeader;
 import org.jetbrains.kotlin.name.Name;
+import org.jetbrains.kotlin.resolve.jvm.JvmClassName;
 import org.jetbrains.kotlin.resolve.scopes.ChainedMemberScope;
 import org.jetbrains.kotlin.resolve.scopes.MemberScope;
 import org.jetbrains.kotlin.serialization.ClassData;
@@ -79,8 +80,9 @@ public final class DeserializedDescriptorResolver {
             String[] strings = kotlinClass.getClassHeader().getStrings();
             assert strings != null : "String table not found in " + kotlinClass;
             PackageData packageData = JvmProtoBufUtil.readPackageDataFrom(data, strings);
+            JvmPackagePartSource source = new JvmPackagePartSource(JvmClassName.byClassId(kotlinClass.getClassId()));
             return new DeserializedPackageMemberScope(
-                    descriptor, packageData.getPackageProto(), packageData.getNameResolver(), components,
+                    descriptor, packageData.getPackageProto(), packageData.getNameResolver(), source, components,
                     new Function0<Collection<Name>>() {
                         @Override
                         public Collection<Name> invoke() {

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/kotlin/JvmPackagePartSource.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.load.kotlin
+
+import org.jetbrains.kotlin.resolve.jvm.JvmClassName
+import org.jetbrains.kotlin.serialization.deserialization.descriptors.PackagePartSource
+
+class JvmPackagePartSource(val className: JvmClassName) : PackagePartSource