[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/objects/nestedClassInAnonymousObject.fir.kt

@@ -0,0 +1,11 @@
+class X {
+    val foo = object {
+        class Foo
+    }
+
+    fun test() {
+        object {
+            class Foo
+        }
+    }
+}