* [CUDA] Op strategy changes for Int8 schedules.

* Applying Haichen's suggestions.

* Make 4D output work for task extraction.

* Make x86 work.

* Fix lint.

* Lint fixes.

* Tests, comments, out channel a multiple of 4.

* Topi test.

Co-authored-by: Ubuntu <ubuntu@ip-172-31-38-96.us-west-2.compute.internal>