[7u-osx] Request for approval for 7131793: [macosx] some cleanup in OGL pipeline code

[Dmitry Cherepanov]

This is a request to push the following fix to jdk7u-osx:
CR: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7131793

Webrev: http://cr.openjdk.java.net/~dcherepanov/7131793/webrev.2

Technical review: 
http://mail.openjdk.java.net/pipermail/macosx-port-dev/2012-January/002537.html

Thanks,
Dmitry