[9] RfR: 8165271: Fix use of reflection to gain access to private fields

[David DeHaven]

JBS Issue:
https://bugs.openjdk.java.net/browse/JDK-8165271

Webrev:
http://cr.openjdk.java.net/~ddehaven/8165271/jdk.0/

Synopsis:
An upcoming change in the module system will prevent setAccessible calls from 
working across module boundaries. This patch allows the use of SharedSecrets 
instead to preserve the underlying logic.

-DrD-