Add listener for module descriptor invalidation

compiler/frontend/src/org/jetbrains/kotlin/analyzer/AbstractResolverForProject.kt

@@ -153,6 +153,7 @@ abstract class AbstractResolverForProject<M : ModuleInfo>(
             oldDescriptor.isValid = false
             moduleInfoByDescriptor.remove(oldDescriptor)
             resolverByModuleDescriptor.remove(oldDescriptor)
+            projectContext.project.messageBus.syncPublisher(ModuleDescriptorListener.TOPIC).moduleDescriptorInvalidated(oldDescriptor)
         }
 
         val moduleData = createModuleDescriptor(module)

compiler/frontend/src/org/jetbrains/kotlin/analyzer/ModuleDescriptorListener.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.analyzer
+
+import com.intellij.util.messages.Topic
+import org.jetbrains.kotlin.descriptors.ModuleDescriptor
+
+interface ModuleDescriptorListener {
+    fun moduleDescriptorInvalidated(moduleDescriptor: ModuleDescriptor)
+
+    companion object {
+        @JvmField
+        val TOPIC: Topic<ModuleDescriptorListener> =
+            Topic.create("ModuleDescriptorListener", ModuleDescriptorListener::class.java)
+    }
+}