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073ea28d58cb97bbb101d15788afc71df4e8ef78
CCGSubsurf has already a function to disable calculation of normals, but seems it wasn't used. This patch changes subsurf UV and subsurf_calculate_limit_positions() to not calculate normals, and also not allocate space for them. Should be no functional changes, just a small speedup/less memory use during subdivision for these cases. Code review link: http://codereview.appspot.com/5558058/
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