RFR: 7103570 AtomicIntegerFieldUpdater does not work when SecurityManager is installed

[David Holmes]

http://cr.openjdk.java.net/~dholmes/7103570/webrev/

Basic fix is to call getDeclaredField() inside a doPrivileged block.

In addition the call to checkPackageAccess is now conditional - it 
allows for, for example, a class in sun.misc to create a field updater 
for another class in sun.misc.

Finally the @throws spec for newUpdater has been expanded to say:

   @throws RuntimeException with a nested reflection-based
   exception if the class does not hold field or is the wrong type,
+ or the field is inaccessible to the caller according to Java language
+ access control

This last part requires CCC approval which I will initiate.

I have a glitch with running the test under jtreg but hopefully that 
will get sorted soon (jtreg fails if a security manager is installed).

Thanks,
David Holmes
------------