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

compiler/testData/diagnostics/tests/smartCasts/explicitDefaultGetter.fir.kt

@@ -0,0 +1,12 @@
+// !WITH_NEW_INFERENCE
+class ExplicitAccessorForAnnotation {
+    val tt: String? = "good"
+        get
+
+    fun foo(): String {
+        if (tt is String) {
+            return tt
+        }
+        return ""
+    }
+}