Add portable upsample_nearest2d kernel #7464
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Summary:
Add a upsample_nearest2d kernel to the portable kernel library. This implementation re-uses some of the inner logic from the ATen implementation (see Upsample.h and UpsampleKernel.cpp), however I have not ported the outer kernel structure as it relies on TensorIterator and runtime allocation.
It may be worth re-visiting this in the future, either by looking at pulling in more of the ATen implementation or adding an optimized variant.
Differential Revision: D66089829