Lambda with more than 22 parameter fails cast to FunctionXXL

If the code of `tests/pos/functionXXL.scala` is executed, the there is a ClassCastException thrown at:

```scala
java.lang.ClassCastException: Test$$$Lambda$1/2051853139 cannot be cast to scala.FunctionXXL
	at Test$.<init>(functionXXL.scala:28)
	at Test$.<clinit>(functionXXL.scala)
	at Test.main(functionXXL.scala)
```