Remove THCTensorMathReduce.cuh (#66389)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/66389
Test Plan: Imported from OSS
Reviewed By: ejguan
Differential Revision: D31547711
Pulled By: ngimel
fbshipit-source-id: c181d14f66536b6873b5b14088312c6c70bf0855
