From Richard: Improve wireframe with clip plane performance (about 40%) by turning off unneeded gl states.
From Richard:
Improve wireframe with clip plane performance (about 40%) by
turning off unneeded gl states.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@14081 27541ba8-7e3a-0410-8455-c3a389f83636

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