Use codegen box tests for tail calls as diagnostic tests too

compiler/testData/codegen/box/functions/tailRecursion/thisReferences.kt

@@ -1,3 +1,5 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
 class A {
     tailRecursive fun f1(c : Int, x : Any) {
         if (c > 0) {
@@ -11,8 +13,8 @@ class A {
         }
     }
 
-    tailRecursive fun f3(a : A, x : Any) {
-        a.f3(a, "no tail") // non-tail recursion, could be potentially resolved by condition if (a == this) f3() else a.f3()
+    <!NO_TAIL_CALLS_FOUND!>tailRecursive fun f3(a : A, x : Any)<!> {
+        a.<!NON_TAIL_RECURSIVE_CALL!>f3<!>(a, "no tail") // non-tail recursion, could be potentially resolved by condition if (a == this) f3() else a.f3()
     }
 }