RFR: 8156192: Provider#compute and #merge methods expect wrong permission & #compute ClassCastException even with wrong permission.

[Anthony Scarpino]

Hi,

I need a simple review on fixing some cut-n-paste errors that the JCK 
tests found.

I didn't include the tests because the functionality is covered by the 
JCK tests and I don't feel typos need a regression test.

http://cr.openjdk.java.net/~ascarpino/8156192/webrev/

Tony