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

compiler/testData/diagnostics/tests/when/PropertyNotInitialized.fir.kt

@@ -0,0 +1,16 @@
+// See KT-5113
+enum class E {
+    A,
+    B
+}
+
+class Outer(e: E) {
+    private val prop: Int
+    init {
+        when(e ) {
+            // When is exhaustive, property is always initialized
+            E.A -> prop = 1
+            E.B -> prop = 2
+        }
+    }
+}