RFR(M) 8212605: Pure-Java implementation of AccessController.doPrivileged

[dean.long at oracle.com]

I made a pass at improving the comments based on feedback I've 
received.  I updated webrev.4 in place, along with an incremental diff:

http://cr.openjdk.java.net/~dlong/8212605/webrev.4.update/

dl

On 10/31/18 9:39 PM, Bernd Eckenfels wrote:
> I find the tail call optimization comment in wrapException adds only 
> confusion to an otherwise clear helper. But maybe it’s just me who 
> does not understand it.