KT-4982 this$0 is not initialized in the anonymous object

#KT-4982 Fixed

compiler/testData/codegen/box/super/kt4982.kt

@@ -0,0 +1,21 @@
+abstract class WaitFor {
+    {
+        condition()
+    }
+
+    abstract fun condition() : Boolean;
+}
+
+fun box(): String {
+    val local = ""
+    var result = "fail"
+    val s = object: WaitFor() {
+
+        override fun condition(): Boolean {
+            result = "OK"
+            return result.length == 2
+        }
+    }
+
+    return result;
+}