Review request for the incorrect check for "getClassLoader" permission

[Mandy Chung]

David, Paul,

I have a fix for the incorrect check w.r.t. "getClassLoader" permission 
[1] and also update j.u.c.atomic for module mode.

Webrev at:
    
http://cr.openjdk.java.net/~mchung/jigsaw/webrevs/getclassloader-permission-fix/

The security.sh test demonstrates what can be accessed in module mode 
and lists the open issue.  This patch is intended to fix the bug 
introduced in this changeset:
http://hg.openjdk.java.net/jigsaw/jigsaw/jdk/rev/7b282c826118

Since there is no parent-child delegation relationship and the existing 
security check applies, it can only access its own class loader in 
module mode.  This remains an open issue what security checks would be 
appropriate in module mode and how well it plays with existing java 
security policy file etc.

As for testing, I ran test/java/util/concurrent/atomic tests in hybrid 
mode and they passed (in fact I verified all java/lang and java/util 
tests). Since AtomicUpdaters is marked to run in othervm mode, I 
manually converted it as a module and it passes.

Thanks
Mandy
[1] http://mail.openjdk.java.net/pipermail/jigsaw-dev/2012-May/002614.html