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

compiler/testData/diagnostics/tests/when/kt9929.fir.kt

@@ -0,0 +1,10 @@
+// !WITH_NEW_INFERENCE
+val test: Int = if (true) {
+    when (2) {
+        1 -> 1
+        else -> null
+    }
+}
+else {
+    2
+}