Review request for 8005801

[A. Sundararajan]

* The new file SetMethodCreator.java misses copyright header
* SpillProperty "slot" field has been made package-private and 
non-final. Is it used outside class and is it updated after construction?

-Sundar

Attila Szegedi wrote:
> Please review https://jbs.oracle.com/bugs/browse/JDK-8005801 at http://cr.openjdk.java.net/~attila/8005801/webrev.01
>
> "ScriptObject.findSetMethod() is a huge, complex method. It needs to be refactored into an easy to understand form."
>
> Thanks,
>   Attila.