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

compiler/testData/diagnostics/tests/smartCasts/publicVals/protected.fir.kt

@@ -0,0 +1,17 @@
+public open class X {
+    protected val x : String? = null
+    public fun fn(): Int {
+        if (x != null)
+            // Smartcast is possible for protected value property in the same class
+            return x.length
+        else
+            return 0
+    }
+}
+
+public class Y: X() {
+    public fun bar(): Int {
+        // Smartcast is possible even in derived class
+        return if (x != null) x.length else 0
+    }
+}