Add line marker test for sealed classes #KT-20043 Fixed

idea/testData/multiModuleLineMarker/fromActualSealedClass/common/common.kt

@@ -0,0 +1,11 @@
+// !CHECK_HIGHLIGHTING
+
+expect sealed class Sealed {
+
+    object Sealed1 : Sealed
+
+    class Sealed2 : Sealed {
+        val x: Int
+        fun foo(): String
+    }
+}