[7u6] Review request for 7168550: [macosx] duplicate OGL context state changes related to vertex cache

[Dmitry Cherepanov]

This is a direct back port (and reverting the change for 7154505) of the 
fix to jdk7u6.

Bug: http://bugs.sun.com/view_bug.do?bug_id=7168550

Webrev: http://cr.openjdk.java.net/~dcherepanov/7168550/7u6/webrev.0/

Thanks,
Dmitry