Fix compiler tests

compiler/testData/diagnostics/tests/inner/nestedClassAccessedViaInstanceReference.kt

@@ -6,21 +6,21 @@ class WithClassObject {
     class Nested()
     class NestedWithClassObject { companion object : N }
     enum class NestedEnum { A }
-    object NestedObj : N { fun invoke() = 1 }
+    object NestedObj : N { operator fun invoke() = 1 }
 }
 
 class WithoutClassObject {
     class Nested()
     class NestedWithClassObject { companion object : N }
     enum class NestedEnum { A }
-    object NestedObj : N { fun invoke() = 1 }
+    object NestedObj : N { operator fun invoke() = 1 }
 }
 
 object Obj {
     class Nested()
     class NestedWithClassObject { companion object : N }
     enum class NestedEnum { A }
-    object NestedObj : N { fun invoke() = 1 }
+    object NestedObj : N { operator fun invoke() = 1 }
 }
 
 fun test(with: WithClassObject, without: WithoutClassObject, obj: Obj) {

compiler/testData/diagnostics/tests/inner/nestedClassAccessedViaInstanceReference.txt

@@ -44,7 +44,7 @@ public object Obj {
         public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
         public open override /*1*/ /*fake_override*/ fun foo(): kotlin.Int
         public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-        public final fun invoke(): kotlin.Int
+        public final operator fun invoke(): kotlin.Int
         public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
     }
 
@@ -106,7 +106,7 @@ public final class WithClassObject {
         public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
         public open override /*1*/ /*fake_override*/ fun foo(): kotlin.Int
         public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-        public final fun invoke(): kotlin.Int
+        public final operator fun invoke(): kotlin.Int
         public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
     }
 
@@ -161,7 +161,7 @@ public final class WithoutClassObject {
         public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
         public open override /*1*/ /*fake_override*/ fun foo(): kotlin.Int
         public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-        public final fun invoke(): kotlin.Int
+        public final operator fun invoke(): kotlin.Int
         public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
     }