Make is_contiguous checks generic in number of arguments (#21106)
Summary:
Loops.h has contains specializations for cases where all the inputs are
contiguous as well as cases where one input is a scalar and all other
inputs are contiguous.
Previously, there were separate checks for each functions that take
zero, one, or two input arguments. This is getting unwieldy, especially
once we add support for functions that take three inputs (#21025).
This requires the use of recursive templates (which have their own
downsides), but this seems better than the alternative.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21106
Differential Revision: D15562430
Pulled By: colesbury
fbshipit-source-id: 5f19ab2212e16e29552887f4585c2b4a70309772
