RFR: 8231413: Several test/hotspot/jtreg/runtime tests updates to run with --illegal-access=deny

[Alan Bateman]

Every few months I run the tests with --illegal-access=deny to make sure 
that we won't have hundreds of tests to fix when the day comes to 
encapsulate the core modules at runtime. This time I found a few 
(recently added) tests in test/hotspot/jtreg/runtime that need 
--add-exports to use ASM, and one that needs to add a private field in 
java.nio.

The changes are test only and trivial:
http://cr.openjdk.java.net/~alanb/8231413/webrev/index.html

-Alan.