Add count_include_pad arg for AveragePoolOp on GPU (#15787)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15787
Add count_include_pad arg for AveragePoolOp on GPU
Reviewed By: houseroad
Differential Revision: D13589185
fbshipit-source-id: 235a84cfcd2033ee796c13e338fc3d03e832b5b1
