efaf512406c71606d7f05eca10c74510bd9ebc12

This commit leads to random freezes in Cycles rendering: https://projects.blender.org/tracker/index.php?func=detail&aid=32545&group_id=9&atid=498 The goal of this commit was to remove UI lag for OSL, but since that is not officially supported yet, better revert it until a proper fix can be implemented in 2.65.
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