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

compiler/testData/diagnostics/tests/cast/bare/NullableAsNullableNotEnough.fir.kt

@@ -0,0 +1,9 @@
+// !CHECK_TYPE
+
+interface Tr
+interface G<T>
+
+fun test(tr: Tr?) {
+    val v = tr as G?
+    checkSubtype<G<*>>(v!!)
+}