<AWT Dev> RFR: 8227587: Add internal privileged System.loadLibrary

[Claes Redestad]

Hi,

by adding a method to load libraries with privileges to JavaLangAccess,
we can simplify a slew of places where we are currently implementing
adhoc privileged actions. This is a tiny but measurable gain on a range
of startup tests.

Webrev:  http://cr.openjdk.java.net/~redestad/8227587/open.00
Bug:     https://bugs.openjdk.java.net/browse/JDK-8227587
Testing: tier1-3

Thanks!

/Claes