RFR 8064331: JavaSecurityAccess.doIntersectionPrivilege() drops the information about the domain combiner of the stack ACC

[Jaroslav Bachorik]

Please, review the following change.

Issue : https://bugs.openjdk.java.net/browse/JDK-8064331
Webrev: http://cr.openjdk.java.net/~jbachorik/8064331/webrev.00
When using JavaSecurity.doIntersectionPrivilege() to invoke a privileged 
operation in ACC that is a result of combining a saved ACC and the stack 
ACC the DomainCombiner assigned to the stack ACC gets lost.

The solution is to explicitly add the stack ACC's DomainCombiner to the 
ACC instance used to execute the privileged operation.

Thanks,

-JB-