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

compiler/testData/diagnostics/tests/callableReference/bound/dataFlow.fir.kt

@@ -0,0 +1,13 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+import kotlin.reflect.KClass
+
+fun f1(x: String?): String {
+    x!!::hashCode
+    return x
+}
+
+fun f2(y: String?): String {
+    val f: KClass<*> = (y ?: return "")::class
+    return y
+}