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

compiler/testData/diagnostics/tests/smartCasts/variables/varNotChangedInLoop.fir.kt

@@ -0,0 +1,8 @@
+public fun foo() {
+    var i: Any = 1
+    if (i is Int) {
+        while (i != 10) {
+            i++
+        }
+    }
+}