Implement channels last upsample2d/3d forward pass kernel. (#34597)
Summary:
Thi PR implement channel last upsampling nearest for 2D/3D.
This is supposed to be faster, plus, avoids converting formats going in
and out of operator.
Will post benchmarking numbers.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34597
Test Plan: python test/test_nn.py TestNN.test_upsamplingNearest3d_channels_last
Differential Revision: D20390583
Pulled By: kimishpatel
fbshipit-source-id: e0162fb97604a261887f38fc957d3f787c80954e
