Enable complex backward for torch.take() and tensor.fill_() (#46860)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/46860
Test Plan: Imported from OSS
Reviewed By: izdeby
Differential Revision: D24544601
Pulled By: anjali411
fbshipit-source-id: 4e29d48da30da3630cb558ccee464d89780b1ab7
