pytorch

ec81cd55 - Migrate implementations of triu and tril to a separate file (#28750)

Migrate implementations of triu and tril to a separate file (#28750) Summary: Having them in BatchLinearAlgebra.cpp/.cu seemed out of place, since they are more general purpose and this code was interspersed between LAPACK and MAGMA wrappers as well. Changelog: - Move tril* / triu* to TriangularOps.cpp/.cu Pull Request resolved: https://github.com/pytorch/pytorch/pull/28750 Test Plan: - Builds should complete successfully to ensure that the migration is error-free - Tests should pass to ensure the methods that the front-end is unaffected. Differential Revision: D18205456 Pulled By: soumith fbshipit-source-id: 41966b9ddfe9f196f4d7c6a5e466782c1985d3d9