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

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

@@ -0,0 +1,15 @@
+// !LANGUAGE: +ProhibitSmartcastsOnLocalDelegatedProperty
+
+class AlternatingDelegate {
+    var counter: Int = 0
+    operator fun getValue(thisRef: Any?, property: KProperty<*>): Any? =
+    if (counter++ % 2 == 0) 42 else ""
+}
+
+fun failsWithClassCastException() {
+    val sometimesNotInt: Any? by AlternatingDelegate()
+
+    if (sometimesNotInt is Int) {
+        sometimesNotInt.inc()
+    }
+}