RFR: 8022718 : Runtime accessibility checking: protected class, if extended, should be accessible from another package

[David Chase]

Further revised after consulting with John Rose on details of fix:

webrev: http://cr.openjdk.java.net/~drchase/8022718/webrev.02/

tests:
jtreg of jdk/lambda java/lang/invoke java/util/stream
defmeth (a/b testing)
jprt in progress (assuming I got the incantation right)

David