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

compiler/testData/diagnostics/tests/when/kt9972.fir.kt

@@ -0,0 +1,18 @@
+// !WITH_NEW_INFERENCE
+fun test1(): Int {
+    val x: String = if (true) {
+        when {
+            true -> Any()
+            else -> null
+        }
+    } else ""
+    return x.hashCode()
+}
+
+fun test2(): Int {
+    val x: String = when {
+                        true -> Any()
+                        else -> null
+                    } ?: return 0
+    return x.hashCode()
+}