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

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

@@ -0,0 +1,15 @@
+fun x(): Boolean { return true }
+
+public fun foo(pp: String?, rr: String?): Int {
+    var p = pp
+    var r = rr
+    do {
+        do {
+            p!!.length
+        } while (r == null)  
+    } while (!x())
+    // Auto cast possible
+    r.<!INAPPLICABLE_CANDIDATE!>length<!>
+    // Auto cast possible
+    return p.length
+}