RFR: JDK-8223725: j.l.c.MethodHandleDesc::of throws undocumented exception IllegalArgumentException

[Vicente Romero]

Please review fix [1] for [2] and the corresponding CSR at [3]. The fix 
is just adding a missing @throws at method j.l.c.MethodHandleDesc::of. 
It is a one liner fix,

Thanks,
Vicente
[1] http://cr.openjdk.java.net/~vromero/8223725/webrev.00/
[2] https://bugs.openjdk.java.net/browse/JDK-8223725
[3] https://bugs.openjdk.java.net/browse/JDK-8223920