Fix KT-26478: Objective-C-objects-class-name-is-null-in-ClassCastExceptions-message

#KT-26478 Fixed

Merge-request: KT-MR-6405
Merged-by: Vladimir Sukharev <Vladimir.Sukharev@jetbrains.com>

kotlin-native/backend.native/tests/interop/objc/tests/kt26478.kt

@@ -0,0 +1,21 @@
+import kotlin.test.*
+import objcTests.*
+
+class KT26478
+
+@Test
+fun testKT26478compiletime() {
+    val exception = assertFailsWith<ClassCastException> {
+        NSBundle() as KT26478
+    }
+    assertEquals("class NSBundle cannot be cast to class KT26478", exception.message)
+}
+
+val bundle26478:Any = NSBundle()
+@Test
+fun testKT26478runtime() {
+    val exception = assertFailsWith<ClassCastException> {
+        bundle26478 as KT26478
+    }
+    assertEquals("class NSBundle cannot be cast to class KT26478", exception.message)
+}

kotlin-native/backend.native/tests/interop/objc/tests/kt35544.kt

@@ -7,3 +7,12 @@ fun testKT35544() {
     }
     assertEquals("class kotlin.Int cannot be cast to class objcTests.NSString", exception.message)
 }
+
+val bundle35544: Any = NSBundle()
+@Test
+fun testKT35544runtime() {
+    val exception = assertFailsWith<TypeCastException> {
+        bundle35544 as NSString
+    }
+    assertEquals("class NSBundle cannot be cast to class objcTests.NSString", exception.message)
+}