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

compiler/testData/diagnostics/tests/cast/kt15161.fir.kt

@@ -0,0 +1,7 @@
+// !WITH_NEW_INFERENCE
+class Array<E>(e: E) {
+    val k = Array(1) {
+        1 as Any
+        e as Any?
+    }
+}