Fix advanced indexing on "huge" Tensors (#20919)
Summary:
This fixes advanced indexing in cases where there's more than 2^31-1
bytes in the output. The `gpu_index_kernel` was missing the
`can_use_32bit_indexing`/`with_32bit_indexing` check.
This also adds a number of TORCH_INTERNAL_ASSERTS in Loops.cuh,
OffsetCalculator, and IntDivider that sizes are fit in a signed 32-bit
integer.
More comprehensive tests that require a 32 GB GPU are here:
https://gist.github.com/colesbury/e29387f5851521256dff562be07b981e
Fixes #20888
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20919
Differential Revision: D15501945
Pulled By: colesbury
fbshipit-source-id: e876e678e866d2efda8ee92c47a1d2d1310671f0
