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

compiler/testData/diagnostics/tests/subtyping/localAnonymousObjects.fir.kt

@@ -0,0 +1,5 @@
+// !DIAGNOSTICS: -ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE -UNUSED_VALUE
+fun test() {
+    var x = object {}
+    x = object {}
+}