Summary: I was trying to speed up the lighting computations, but my ideas didn't work. Even if that didn't work, we can at least commit the benchmarking script I wrote for diffuse and specular shading.
Reviewed By: nikhilaravi
Differential Revision: D21580171
fbshipit-source-id: 8b60c0284e91ecbe258b6aae839bd5c2bbe788aa
