Enable complex tests that depend on batched matmul on CUDA (#47910)
Summary:
Now when https://github.com/pytorch/pytorch/pull/42553 is merged we can delete a bit of code from the tests and enable some of the skipped complex tests.
Unfortunately, `test_pinverse_complex_xfailed` and `test_symeig_complex_xfailed` had bugs and it wasn't caught automatically that these tests xpass. Need to be careful next time with `unittest.expectedFailure`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47910
Reviewed By: zhangguanheng66
Differential Revision: D25052130
Pulled By: mruberry
fbshipit-source-id: 29512995c024b882f9cb78b7bede77733d5762d0
