Use codegen box tests for tail calls as diagnostic tests too

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

@@ -1,10 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
 tailRecursive fun test(x : Int, a : Any) : Int {
     var z = if (x > 3) 3 else x
     while (z > 0) {
         if (z > 10) {
             return test(x - 1, "tail")
         }
-        test(0, "no tail")
+        <!NON_TAIL_RECURSIVE_CALL!>test<!>(0, "no tail")
         z = z - 1
     }