IDEA-86810 Find Usages not finding usages when I do it on decompiled stub source

java/java-psi-impl/src/com/intellij/psi/impl/PsiClassImplUtil.java

@@ -15,6 +15,7 @@
  */
 package com.intellij.psi.impl;
 
+import com.intellij.lang.ASTNode;
 import com.intellij.openapi.components.ServiceManager;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.progress.ProgressIndicatorProvider;
@@ -964,9 +965,12 @@ public class PsiClassImplUtil {
 
   private static PsiElement originalElement(PsiClass aClass) {
     final PsiElement originalElement = aClass.getOriginalElement();
-    final PsiCompiledElement compiled = originalElement.getUserData(ClsElementImpl.COMPILED_ELEMENT);
-    if (compiled != null) {
-      return compiled;
+    ASTNode node = originalElement.getNode();
+    if (node != null) {
+      final PsiCompiledElement compiled = node.getUserData(ClsElementImpl.COMPILED_ELEMENT);
+      if (compiled != null) {
+        return compiled;
+      }
     }
     return originalElement;
   }

java/java-tests/testData/psi/search/findUsages/libraryClassUsageFromDecompiledSource/Usage.java

@@ -0,0 +1,5 @@
+import javax.swing.JLabel;
+
+public class Usage {
+  JLabel s;
+}

java/java-tests/testSrc/com/intellij/psi/search/FindUsagesTest.java

@@ -89,6 +89,12 @@ public class FindUsagesTest extends PsiTestCase{
     assertEquals(1, ReferencesSearch.search(method).findAll().size());
   }
 
+  public void testLibraryClassUsageFromDecompiledSource() {
+    PsiElement decompiled =
+      ((PsiCompiledElement)myJavaFacade.findClass("javax.swing.JLabel", GlobalSearchScope.allScope(myProject))).getMirror();
+    assertEquals(2, ReferencesSearch.search(decompiled).findAll().size());
+  }
+
   public void testImplicitConstructorUsage() throws Throwable {
     PsiMethod[] ctrs = myJavaFacade.findClass("Foo", GlobalSearchScope.allScope(myProject)).getConstructors();
     PsiMethod method = ctrs[0];