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

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

@@ -0,0 +1,19 @@
+fun x(): Boolean { return true }
+
+public fun foo(qq: String?): Int {
+    var q = qq
+    while(true) {
+        q!!.length
+        var r = q
+        do {
+            var p = r
+            do {
+                // p = r, r = q and q is not null
+                p.length
+            } while (!x())
+        } while (r == null) // r = q and q is not null
+        if (!x()) break
+    }
+    // Smart cast is possible
+    return q.length
+}