[FE] Add test for compiling against library with kotlin sealed classes and interfaces

#KT-20423
#KT-13495

compiler/testData/compileKotlinAgainstCustomBinaries/sealedClassesAndInterfaces/main.kt

@@ -0,0 +1,36 @@
+import test.*
+
+fun test_1(base: IBase) {
+    val x = when (base) {
+        is IA -> 1
+        is B -> 2
+        is C -> 3
+        is D -> 4
+    }
+}
+
+fun test_2(base: IBase) {
+    val x = when (base) {
+        is IA -> 1
+        is B.First -> 2
+        is B.Second -> 3
+        C.SomeValue -> 4
+        C.AnotherValue -> 5
+        D -> 6
+    }
+}
+
+fun test_3(base: Base) {
+    val x = when (base) {
+        is B -> 2
+        is D -> 4
+    }
+}
+
+fun test_4(base: Base) {
+    val x = when (base) {
+        is B.First -> 2
+        is B.Second -> 3
+        D -> 6
+    }
+}