[CUDA] Do accumulation for Adaptive Average Pooling in `opmath_t` (#99378)
Fix for an issue surfaced from the discuss forum: https://discuss.pytorch.org/t/adaptiveavgpool2d-causes-some-data-to-contain-inf/177420
CC @ptrblck @ngimel
Pull Request resolved: https://github.com/pytorch/pytorch/pull/99378
Approved by: https://github.com/ngimel
