avg_pool2d avg_pool3d for LongTensor (#22433)
Summary:
Generate avg_pool2d/avg_pool3d for LongTensor for CPU.
Added divisor_override parameter.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22433
Differential Revision: D16108809
Pulled By: ifedan
fbshipit-source-id: 8de7ff585a0479702cceafb5ccf9dfea62a9cc50
