Clear DOM assignability cache on plugin unload (IDEA-240454)

GitOrigin-RevId: b97d867b9048ca0a740414e8c10ecf9c332dfe92

platform/util/src/com/intellij/util/ReflectionAssignabilityCache.java

@@ -31,4 +31,7 @@ public class ReflectionAssignabilityCache {
     return ancestor == descendant || myCache.get(ancestor).get(descendant).booleanValue();
   }
 
+  public void clear() {
+    myCache.clear();
+  }
 }

xml/dom-impl/src/com/intellij/util/xml/impl/DomApplicationComponent.java

@@ -81,6 +81,7 @@ public final class DomApplicationComponent {
     myTypeChooserManager.clearCache();
 
     myInvocationCaches.clear();
+    assignabilityCache.clear();
 
     registerDescriptions();
   }