Strided masked reduction: prod. (#66386)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66386
cc nikitaved pearu cpuhrsch
Test Plan: Imported from OSS
Reviewed By: anjali411
Differential Revision: D31779598
Pulled By: cpuhrsch
fbshipit-source-id: 304a3d6abc794a49de5b044aade6cfd727758495
