Port adaptive_max_pool2d to structured kernel (#56317)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/56317
Test Plan: Imported from OSS
Reviewed By: ailzhang
Differential Revision: D27862930
Pulled By: SplitInfinity
fbshipit-source-id: e2d199df0ebaf585698f26fcfda5a0301ba67ade
