RFR (S) 8001109: arity mismatch on a call to spreader method handle should elicit IllegalArgumentException

[John Rose]

Please review this change for a change to the JSR 292 implementation:

http://cr.openjdk.java.net/~jrose/8001109/webrev.00/

The change is mostly to javadoc and unit tests, documenting and testing some corner cases of JSR 292 APIs.

In the RI, the exception-raising code is simplified to throw just IAE.

Thanks,
— John