Optimize nchw MaxPooling (#7426)

* first debug

* fix maxpool

* fix bug

* remove redundant code

* remove redundant read

* remove redundant data_ptr offset

* use int32 to describe x shape

* Fix cuda input params for maxpool2d

* just for debug

* just for profile

* reduce div

* use int32_t indice

* revert back to use int64_t

* fix maxpool1d 3d

* optimize backward

* fix all optimize. TODO: NHWC

* fix comment

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