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

compiler/testData/diagnostics/tests/smartCasts/varnotnull/ifVarNullElse.fir.kt

@@ -0,0 +1,12 @@
+public fun fooNotNull(s: String) {
+    System.out.println("Length of $s is ${s.length}")
+}
+
+public fun foo() {
+    var s: String? = "not null"
+    if (s == null) {
+        // Coming soon
+    } else {
+        fooNotNull(s)
+    }
+}