Summary:
Update the transform method in the mesh rasterizer class to use the new `update_padded` method on the `Meshes` class to directly update the mesh vertices.
Also added a benchmark.
Reviewed By: gkioxari
Differential Revision: D21700352
fbshipit-source-id: c330e4040c681729eb2cc7bdfd92fb4a51a1a7d6