KotlinAnnotatedElementsSearcher made support Kotlin objects (KT-31332)

idea/src/org/jetbrains/kotlin/idea/search/ideaExtensions/KotlinAnnotatedElementsSearcher.kt

@@ -49,7 +49,7 @@ class KotlinAnnotatedElementsSearcher : QueryExecutor<PsiModifierListOwner, Anno
     override fun execute(p: AnnotatedElementsSearch.Parameters, consumer: Processor<in PsiModifierListOwner>): Boolean {
         return processAnnotatedMembers(p.annotationClass, p.scope) { declaration ->
             when (declaration) {
-                is KtClass -> {
+                is KtClassOrObject -> {
                     val lightClass = declaration.toLightClass()
                     consumer.process(lightClass)
                 }

idea/testData/search/annotations/testAnnotationsOnClass.kt

@@ -6,6 +6,9 @@
 
 @java.lang.Deprecated class TestClass4 {}
 
+@java.lang.Deprecated
+object TestObject {}
+
 class TestClass5 {
     @java.lang.Deprecated class innerTestClass5() {}
 }
@@ -13,4 +16,5 @@ class TestClass5 {
 // ANNOTATION: java.lang.Deprecated
 // SEARCH: class:TestClass1, class:TestClass2, class:TestClass3
 // SEARCH: class:TestClass4
+// SEARCH: class:TestObject
 // SEARCH: class:innerTestClass5