Sparse CSR CUDA: Add block sparse support for torch.triangular_solve (#68709)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68709
This PR adds support for triangular solver with a block CSR matrix.
cc nikitaved pearu cpuhrsch IvanYashchuk ngimel
Test Plan: Imported from OSS
Reviewed By: ngimel
Differential Revision: D33066067
Pulled By: cpuhrsch
fbshipit-source-id: 9eaf1839071e9526be8d8c6d47732b24200f3557
